But Mortlake, no matter what his other faults, possessed a cool head. The instant he lost control of the motor, he seized the warping levers, and began manipulating them. At the same time he set the rudder so as to bring the Silver Cobweb to earth in a series of long spirals. The maneuver was that of volplaning, and has been performed successfully by several aviators whose engines have suddenly ceased to work while in mid-air. The young officer watched approvingly. Whatever else Mortlake might be—and Lieut. Bradbury had not taken a violent fancy to him—he was a master of the aerial craft.

Despite the mishap to the engine—caused by his own carelessness—Mortlake managed to bring the Silver Cobweb to a gentle landing in a broad, flat meadow, inhabited by some spotted cows, which fled in undignified panic as the monster, silent now, swooped down like a bolt from the blue.

The instant the Silver Cobweb came to rest Mortlake's restless eyes glanced upward. He was hoping against all common sense that the young Prescotts had not seen his mishap, or at least that they would pass on above him unnoticing. His first glance showed him the Golden Butterfly still steadily plugging along, and a moment later it became apparent that they had seen the sudden descent of the Cobweb, for the aeroplane was seen to dip and glide lower, much as a mousing hawk can be seen to do.

"Hard luck," murmured the young naval officer, as Mortlake, who had clambered out of the machine, stamped and fumed by its side. Inwardly Lieut. Bradbury was thinking how stubborn men invariably meet with some mishap or accident.

"Yes, beastly hard luck," agreed Mortlake readily. "I see a farm-house over there, though, the other side of those trees. I guess I can get a bucket and some water over there. Once I've cooled those cylinders off, we'll be all right."

"How long will that take, do you think?" inquired the officer, pulling out his watch and a time-table.

"Not more than half an hour. It shouldn't take that."

"That means I miss my train. If we don't get into Sandy Beach by eleven o'clock, I can't possibly make it. And there's not another from there for two hours. That would make me late for my appointment at Mineola."

Mortlake's face fell. Here was a bit of hard luck with a vengeance. It might cost him a place in the contests.

"We can make up time, once we get under way," he said tentatively.

"That isn't it. I daren't risk it. I wonder if I can get an automobile or some sort of a conveyance about here."

"Not a chance. I know this neighborhood. It is very sparsely settled."

A sudden whir above them caused them both to look up. It was the Golden Butterfly, swooping and hovering above the disabled Cobweb.

"Had an accident?" shouted down Roy.

"What do you think? You can see we're not flying, can't you?" bellowed Mortlake, his face crimson with anger and mortification.

"Can we do anything to help you?" came from Peggy, ignoring the fellow's insulting tones.

"No!"

"Yes!"

The first monosyllable came from Mortlake. The second from Lieut. Bradbury.

"If you don't mind accepting a passenger, I should be glad of a lift to Sandy Beach. I've got to make a train," explained the young officer.

In five minutes the Golden Butterfly was on the sward beside the crippled Cobweb. Mortlake's face was black as night. He fulminated maledictions on the young aviators who had appeared at—for him—such an inopportune moment.

"Can I help you fix the machine?" asked Roy pleasantly. "There's nothing serious the matter, is there?"

"Not a thing," asserted Mortlake. "It's all the fault of the men who made the carburetor. They did a bungling bit of work, and the cylinders have overheated."

"Can we leave a message for you at your shops, or would you like a lift home with us?" asked Roy, who felt a kind of pity for the angry and stranded man.

"You can't do anything for me except leave me alone," snapped out Mortlake; "you cubs are altogether too inquisitive. You're too nosy."

"But not to the extent of making sketches and notes, Mr. Mortlake?" inquired Peggy sweetly—"cattily," she said it was, afterward.

Mortlake started and paled. Then, without vouchsafing a reply, he strode off in the direction of the farm house to get the water he needed.

"Now, Mr. Bradbury," said Roy, extending a hand.

The young officer leaped nimbly into the chassis, and presently a buzzing whir told that the faithful Golden Butterfly was taking the air once more.

"Score two for us!" thought Peggy to herself.

From a far corner of the pasture, Mortlake watched his young rivals climbing the sky. He shook his fist at them and his heavy face darkened.



CHAPTER XI.

THE MARKED BILL.

Some two days after the events narrated in our last chapter, Lieut. Bradbury, sitting in the library of the New York Aero Club, on West Fifty-fourth Street, received a telegram from Eugene Mortlake. He was considerably astonished, when on tearing it open, he read as follows:

"Must see you at once. Have positive proof that young Prescott is about to sell out his secrets to foreign government."

"Phew!" whistled the young officer. "This is a serious charge. If it is proved, it will bar Prescott from bidding for the United States government contract. But I can hardly believe it. There must be some mistake. However, it is my duty to investigate. Let's see—three o'clock. I can get a train to Sandy Beach at four. Too bad! Too bad!"

The young officer shook his head. He had come to have a sincere regard for Roy and his pretty sister, as well as admiration for their resourcefulness and pluck.

When it is explained that during the time elapsing between his lucky lift in the Prescott machine and the reception of the note, that Lieut. Bradbury had notified Roy that he would be expected to report at the Brooklyn Navy Yard, his feelings on learning that there was suspicion directed against his young protege, may be imagined. Mortlake, too, had received a notice that his machines were eligible for a test, so that there would have seemed to be no object for his acting treacherously. Otherwise, the young officer might have been suspicious. What he had seen of Mortlake had not particularly elevated that gentleman in his opinion. But if he had desired to wrong the Prescotts, reasoned the officer, such a resourceful man as he had adjudged Mortlake to be, would have sought a deeper and more subtle way of going about it.

"And I'd have staked my word on that boy's loyalty; aye, and on his sister's too," muttered the officer, as he made ready for his hasty trip to Long Island.

By this it will be seen that Lieut. Bradbury was by no means proof against the rather common failing of inclining to believe the first evil report we hear. It is a phase of human nature that is not combatted as it should be.

In the meantime, Roy and Peggy had sustained a surprise, likewise. The day before that on which Lieut. Bradbury received the disturbing dispatch, an automobile had whizzed up to their gate and stopped. Roy, Peggy and Jess and Jimsy were at a game of tennis, when a rather imperious voice summoned them, from the tonneau of the machine.

They looked up, to see a remarkably pretty young girl, who could scarcely have been more than eighteen years old. Her eyes were black as sloes, and flashed like smoldering fires. A great mass of hair of the same color was piled on the top of her head in grown-up fashion, and her gown, of a magenta hue, which set off her dark beauty to perfection, was cut in the most recent—too recent, in fact—style.

"Can you direct me to Mr. Mortlake's aeroplane factory?" she demanded in an imperious tone. Evidently the flushed, healthy-looking young people, who had been playing tennis so hard, were very despicable in her eyes.

"There it is, down the road there," volunteered Roy. "It's that barn-like place."

The appellation was unfortunate. The girl's eyes flashed angrily.

"My name is Regina Mortlake," she said angrily. "I am Mr. Mortlake's daughter. He is not in the habit of putting up barns, I can assure you."

"I beg your pardon——" began Roy, quite taken aback by the extraordinary energy with which the reproof to his harmless remark had been given. But the dark-eyed beauty in the automobile had given a quick order to the chauffeur, and the car skimmed on down the road.

Later that day the Silver Cobweb ascended for a flight. It had nothing more the matter with it on the day of the break-down than the heated cylinders, which, as Mortlake had prophesied, soon cooled. But Mortlake himself did not take up the silvery aeroplane on this occasion. A new figure was at the wheel, clad in dainty dark aviation togs and bonnet, with a fluttering, flowing veil of the same color, which streamed out like a flag of defiance.

The new driver was Miss Regina Mortlake.

They learned later that the girl had taken frequent flights in the South, where her father had, for a time, entered into the business of giving aeroplane flights for money at county fairs and the like. His daughter had taken naturally to the sport, and was an accomplished air woman. She knew no fear, and her imperious, ambitious spirit made her a formidable rival even to the foreign flying women who competed at various international aviation meets.

While his daughter spun through the air, Eugene Mortlake sat in his little glass-enclosed office in one corner of the noisy aeroplane plant. Four finished machines were now ready, and he would have felt capable of facing any tests with them had it not been for his uneasy fear of the Prescott aeroplane. But he had evolved a scheme by which he thought he would succeed in putting Peggy and Roy out of the race altogether. It was in the making that afternoon in the little office.

Opposite to Mortlake sat two men whom we have seen before. But in the cheap, but neat suits they now wore, and with their faces clean-shaven of the growth of stubby beard that had formerly covered them, it would have been somewhat difficult to recognize the two ill-favored tramps who had been routed by Peggy in such a plucky manner. But, nevertheless, they were the men.

"You thoroughly understand your instructions now?" questioned Mortlake, as he concluded speaking.

The fellow who had been addressed by his companion as Joey, at the time they encountered Mortlake and Harding on the road to the Galloway farm, nodded.

"We understand, guv'ner," he rasped out in a hoarse voice; "Slim, here, and me don't take long ter catch on, eh, Slim?"

"No dubious manner of doubt about that," responded Slim. "An' although I'm a tramp now, guv'ner, I wasn't allers one. I've held my head as high as the rest of the good folks of the world. I can play the gentleman to perfection. Don't you worry."

This Slim—or to give him his correct name—Frederick Palmer, was, as he declared with such emphasis, a man who had indeed "seen better days," as the phrase is. Now that he was invested in fair-looking clothes, and was graced with a clean collar and a smooth-shaven face, he actually might have passed for a person in fairly well-to-do circumstances. For the part Mortlake wished him to play, he could not have picked out a better man. Utterly unscrupulous, and with the best of his life behind him, "Slim"—as the tramp fraternity knew him—was prepared to do anything that there was money in. His companion possessed no such saving graces of appearance. Short, coarse, and utterly lacking in every element of refinement, Joey Eccles was a typical hobo. But Mortlake's shrewd mind had seen where he could make use of him, too, in the diabolical plan he was concocting, and the details of which he had just finished confiding to his unsavory lieutenants.

"But say, guv'ner," struck in Joey Eccles, his little pig-like eyes agleam with cupidity, "we've got to have a bit more of the brass, you know—a little more money—eh?"

He ended in an insinuating whine, the cringing plea of the professional beggar.

Mortlake made a gesture of impatience.

"I gave you fellows a twenty-dollar-bill a few days ago," he said, "in addition to that, you've been provided with clothes and lodging. What more do you want?"

"We've got to have some more coin, that's flat," announced Slim decidedly; "come on, fork over, guv'ner. You've gone too far into this now to pull out."

Mortlake's florid face went white. As if he heard it for the first time, the words struck home. He had indeed "gone too far," as the tramp sitting opposite to him had said. He was, in fact, completely in the power of these two unscrupulous mendicants. Making a resolve to get rid of them as speedily as possible, he dived into his breast pocket and drew from it a roll of bills that made Slim's and Joey's eyes stick out of their heads.

He peeled off a twenty-dollar-bill, and flung it with no good grace down upon the table.

"There," he said, "that's the last you'll get till the trick is done."

"Thankee, guv'ner; I knowed you'd see sense. A man of your intelligous intellect, and——"

"That will do," snapped Mortlake. "Do you think I've got nothing to do but talk to you fellows all day? You thoroughly understand, now, to-morrow night on the road to Galloway's farm?"

"Yus, and we've got a nice little deserted farm house all picked out, where we can keep the young rooster on ice," grinned Joey.

"Well, well," shot out Mortlake, "that will be your task. I've nothing to do with that. Do you understand," he rapped the table nervously, "I know nothing about it."

"All right, all right; we're wise," Slim assured him confidently. "Don't you worry. Come on, Joey. Got the money?"

"Have I? Oh, no; I'm goin' ter leave it right here," grinned Joey, enjoying his own irony hugely.

Still chuckling, he arose and shuffled out, followed by the unsavory Slim.

Outside, and on the road to the village, Slim began to be obsessed by doubts.

"Some way, I don't jes' trust that Mortlake," he said. "You're sure that bill is all right, Joey?"

"Sure? Well, you jes' bet I am. Here, look at it yourself. All right, ain't it?"

He drew out the bill and handed it to Slim for his inspection.

"And the best of it is," he chuckled, while Slim inspected the bill carefully, "the best of it is, that I wasn't conformin' to the exact truth when I told Mortlake that we'd spent all the other coin. I've got the best part of it left."

"Good," grunted Slim, turning the twenty-dollar-bill over and examining the reverse side, "that being the case—hullo!"

"What's up?" asked Joey.

For reply Slim handed the bill to Joey, pointing with a grimy first finger at something on the reverse side.

It was an "O," scrawled in dull red ink.

"That would be an easy bill to identify," commented Palmer, uneasily, "wonder if this can be a trap?"

"Well, keep your suspicions to yourself for a while," counseled Joey; "we don't need to break it till we make sure."



CHAPTER XII.

WHAT HAPPENED TO ROY.

It was the next evening. Mortlake, sitting at his desk, looked up as a quick step sounded outside. The factory was in darkness as the men had gone home. Only a twilight dimness illuminated the little glass sanctum of the inventor and constructor of the Mortlake Aeroplane.

"Come in," said Mortlake, as the next instant a sharp, decisive knock sounded.

Lieut. Bradbury, in a mufti suit of gray, stepped into the office.

"Ah, good evening, lieutenant," said Mortlake, rising clumsily to his feet and offering a chair, "I was beginning to despair of you."

Bradbury, genuinely worried, lost no time in plunging into the object of the interview.

"That message you sent me—what does it mean?" he asked. "I can scarcely believe——"

"Nor could I, at first," said Mortlake, with assumed sorrow. "It cut me pretty deep, I tell you, to think that a boy who was in negotiations with his own government for a valuable implement of warfare, should deal with a foreign government at the same time. In brief, this young traitor is balancing the profits and will sell out to the highest bidder."

"That's strong language, Mortlake," said the young officer, drumming the table with his fingers impatiently. Honorable and upright in all his dealings, the young officer had no liking for the business in hand. Yet it was his duty to see the thing through now, unpleasant as it promised to be.

"Strong language?" echoed Mortlake. "Yes, it is strong language, but not a bit more emphatic than the case warrants. Did you know that for some days past a German spy has been in Sandy Beach?"

"No. Certainly not."

"Well, there has been. He visited this plant with proposals to turn over our aeronautic secrets to his government, but we refused to have anything to do with his scheming."

"Yes, very good. Go on, please." The young officer felt that Mortlake was approaching the climax of his story.

"One of our men," resumed Mortlake, in even tones, in which he cunningly managed to mingle a note of regret, "one of our men took upon himself—loyal fellow—to watch this spy. He reported to me some days ago that the man was in negotiation with young Prescott."

"Good heavens!"

"I know it sounds incredible, but we are dealing with facts. Well, more than this, my zealous workman ascertained that young Prescott is to meet this foreign agent at nine o'clock to-night on a lonely road, and is there to hand over to him the complete plans and specifications of the Prescott aeroplane."

"It's unbelievable, horrible. And in the face of this, do you mean to say that the boy would dare to keep up his apparent negotiations with the United States?"

"That's just the worst part of it, as I understand it," rejoined Mortlake. "The negotiations with this foreigner would, of course, be presumed by young Prescott to be secret. This being so, he would, if successful in the tests, sell his ideas to the United States also, without mentioning the fact that they had already been bought and paid for."

"Monstrous!"

"Just what I said when I heard of it. I could not believe it, in fact. The boy has always seemed to be all that was upright and honest. It just shows how we can be mistaken in a person."

"I cannot credit it yet, Mortlake."

"It was to give you proof positive that I summoned you here. We will take an automobile out to the spot where young Prescott is to meet the foreign agent. Of course, our arrival will be so calculated as to give us time to secrete ourselves before Prescott and the other meet. Are you willing to let your estimate of young Prescott stand or fall by this meeting?"

"I am, yes," replied Lieut. Bradbury, breathing heavily. "The young scoundrel, if he is caught red-handed, I will see if there is not some law that will operate to take care of his case."

Mortlake could hardly conceal a smile. His plan to ruin Roy was working to perfection. In his imagination he saw the Prescott aeroplane eliminated as a naval possibility, and the field clear for the selection of the Mortlake machine. Mentally he was already adding up the millions of profit that would accrue to him.

Lieut. Bradbury left that meeting heavy of heart. Mortlake's story had been so circumstantial, so full of detail, that it hardly left room for doubt. And then, too, he had offered to produce positive proof, to allow the officer to witness the actual transaction.

"Good heavens, isn't there any good in the world?" thought the officer, as the hack in which he had driven out to the Mortlake plant drove him back to the village. Mortlake had agreed to call for him at the little hotel at eight o'clock. The hours till then seemed to have leaden feet to the anxious young officer.

It was shortly before this that Roy, returning from an errand in town in the Prescott automobile, was halted at the roadside by a figure which stepped from the hedge-row, and, holding up a cautioning finger, uttered a sharp:

"Hist!"

Roy, turning, saw a man, seemingly a workingman, from his overalls, at the side of the machine.

"What is it? What do you want?" demanded Roy.

"I have a message for you," said the man, speaking in a slightly foreign accent; "you are in great danger. Your enemies plot it."

"My enemies!" exclaimed Roy.

"Yes, your enemies at the Mortlake factory."

"Let's see," said Roy thoughtfully, "you're one of the workmen at the Mortlake plant, aren't you?"

"I was once," said the man, with a vindictive inflection, "but I am so no longer. Mortlake discharged me."

"Discharged you, eh? Well, what's that got to do with me?"

Roy looked curiously at the man.

"Just this much. I know the meanness that Mortlake plans to do to you. You have bad and wicked enemies at our place."

"Humph! I guess there may be some truth in that," said Roy with a rather grim inflection. "Well, what do you want me to do about it?"

"Just this: I am an honest man. I do not want to see harm come to you or to your sister." This was touching Roy in a tender spot.

"To my sister!" he exclaimed. "Do you mean to say that Mortlake is scoundrel enough to plot against her, too?"

"In this way," explained the man, "he means to destroy your aeroplane, leaving the field clear for his own type to be selected by the navy."

"The—the—the ruffian!" panted Roy, now thoroughly aroused. "Tell me more about this."

"I cannot," rejoined the workman, "but my partner—he was discharged too—he can tell you much, much more. Will you meet him? I can take you to him?"

Roy thought a moment. The man seemed to be wholly honest and in earnest.

"How far from here is the place where your partner is?" he asked.

"Oh, not so very far. We soon get there in your fine machine. Will you go?"

"Well, I—yes, I'll go. Come on, get in."

The man obeyed the invitation with alacrity. Under his directions, Roy swung the car off upon a by-road after they had gone some few hundred yards.

"Not long now," he said, as the vehicle bounced and jounced over the ruts and stones of the little-used thoroughfare.

"This is a funny direction for your partner to live in," said Roy at length. "There are not many dwellings out this way, nothing but a big swamp, as I recollect it."

"My partner, he poor man," was the rejoinder. "He live with cousins out here."

The answer lulled Roy's rousing suspicions.

"It must be all right," he thought. "There can't be any trick in all this. It's quite likely that Mortlake does want to play us a mean trick. I can't forget the look he flashed at me the day we took Lieut. Bradbury away from him in that meadow after we had made our first sea trip. Wow!"

Roy could not forbear smiling at the recollection.

They chugged along in silence for some little distance farther, and then the man beside him laid a detaining hand on Roy's arm.

"Almost there now," he said. "Better slow up."

Roy did so. The brakes ground down with a jarring rasp.

At the same moment a dark figure stepped from behind a tree trunk. The man beside Roy held up a hand.

"This is the young gentleman," he said.

Through the gloom the other figure now approached the automobile.

"Do you mind getting out?" it said. "We can talk better in the house."

"Where is the house? I don't see one," said Roy, his suspicions rousing a little.

"It's just behind that knoll. The path is just ahead," said the newcomer.

Roy got out. He was determined to see the adventure through now. If Mortlake was plotting against him, he wanted to know it.

As he reached the ground, the newcomer extended his hand, as if offering to shake Roy's palm.

Roy put out his hand, which was instantly grasped by the other.

"Your friend tells me that you have something interesting to tell me——" began Roy. "I—here, what are you trying to do? Stop it!"

The other had seized his hand in a clutch of steel, and, before the astonished boy could offer any resistance, had wrenched it over in such a manner that, without exactly knowing what had occurred, Roy found himself sprawling on his back.

The lad was helpless in this lonely place with two men who had now shown themselves in their true and sinister character.



CHAPTER XIII.

PLOT AND COUNTERPLOT.

The spot was fearfully lonely. Roy realized this to the full. Brave as the lad was, he felt suddenly chilled and creepy. Besides, the utter mystery that enveloped the affair was gruelling to the mind.

"Now be still," pleaded the late guide, as Roy, full of fight, jumped to his feet and flung off the detaining hold which had been laid on him.

"Yep. We don't want to hurt you," chimed in another voice, the voice of the powerful, stockily-built man who had thrown him, "be reasonable and quiet now, and you'll come to no harm. If not——" he drew a pistol and presented it at the boy's head.

The hint was rough but effectual. Roy saw that it would be mere folly to attempt resistance.

"What's the meaning of this rough behavior?" he asked in a steady voice, mentally resigning himself to the inevitable.

"You just come with us for a little while," said the gruff-voiced one. "Don't worry; we ain't goin' ter harm you. You'll git loose agin after a while. Don't worry about that."

This assurance, though mysterious, was more or less comforting. But Roy resented the utter mystery of the affair.

"But what's it all for?" he protested. "Is Mortlake at the back of it; or—"

"Now, you come along, young feller," said a gruff voice, "don't axe no questions and you won't git told no lies, see?"

Roy saw.

"Well, go ahead, since I'm in your power," he said. "But I warn you it will go hard with you if ever I am able to set justice on your track."

"Hard words break no bones, guv'ner," came from the gruff-voiced man, who was none other than Joey Eccles, disguised with a big beard. The man who had escorted Roy into the trap was, in truth, a former workman at the Mortlake factory, who had been discharged for incompetency. He had applied at the plant to be taken on again, being well-nigh desperate with hunger, and Mortlake had assigned him to the present task, for which, if the truth be told, he had no great liking.

"Where do you want me to go?" was Roy's next question, as neither of his captors had yet made a move.

"We'll show you fast enough, young guv'ner," said Joey through his beard. "Come on, this way."

He caught hold of Roy's arm and began piloting him along a path, or rather cow track, that ran across the meadow. It was now almost dark, and Roy, after they had gone a few steps, was only able to make out the dark outlines of what seemed to be a small hut on the edge of a dense woods lying directly ahead of them.

"I suppose that's our destination," thought the boy. "Well, they have not attempted any violence, and I guess if they had meant me any physical harm they would have attacked me when they first trapped me. But what does all this mean? That's the question."

Nothing more was said as the three, the captors and the prisoner, tramped across the dewy grass. As they drew closer to the building Roy had descried, he saw that it was a dilapidated looking affair. Shutters hung crazily from a single hinge, broken window-panes looked disconsolately out. In the roof was a yawning gap, from which a great owl flapped as they drew closer. Evidently the place had not been occupied as a dwelling for many years.

The door, however, was open, and, with the pistol still menacing him, Roy was marched by his captors into the moldy, smelling place.

Handing his pistol to the other man, gruff-voice—otherwise Joey Eccles—struck a match. Carefully screening it from the draughts which swept through the rickety building, he led the way into a bare room in which was a tumble-down table and two boxes to serve as seats. A pack of greasy cards lay on the table-top, showing that Joey had been passing his time at solitaire.

This fact showed Roy that the plot had been carefully concocted, and that the trap was all ready to be sprung much earlier in the day. Only a brain like Mortlake's, he reasoned, could have thought out such an intricate plan. And yet, what could be Mortlake's object?

"Now, then," announced Joey, when he had lighted the tin kerosene lamp, "I'll show you to your quarters, Master Prescott."

A chill ran through Roy at the words. What could be coming now? With his pistol in his hand, Joey gently urged Roy into a rear room, his companion following with the lamp. Once in the room, Joey stepped forward, and, stooping down, raised a trap door in the centre of the floor. A rank, musty smell rushed up as he opened it.

"Thar's your abode for the next three or four hours," he said with a grin to Roy and pointing downward.

The boy shuddered.

"Not in there?" he said.

"Them's our orders," said Joey shortly. "There's a ladder there now. You can climb down on that. Don't be scared. It's only a cellar, and guaranteed snake-proof. When the time comes, we'll lower the ladder to you again, an' git you out."

Roy looked desperately about him. Unarmed, he knew that he did not stand a chance against his burly captives, but had it not been for the fact that one of them had a pistol, he would have, even then, attempted to make a break for liberty. But as it was—hopeless!

He nodded as Joey pointed downward into the dark, rank hole, and, with an inward prayer, he slowly descended the ladder. The instant his feet touched the ground, Joey, who had been holding the lamp above the trapdoor, ordered his companion to pull up the ladder.

The next moment it was gone, and the trapdoor was slammed to with an ominous crash.

Roy was enveloped in pitchy darkness. Suddenly, through the gloom, he heard a sound. It was the rasp of a padlock being inserted in the door above him. Then came a sharp click, and the boy knew that hope of escape from above had been cut off. If the men kept their promise, they would release him in their own good time, and that was all he had to buoy him up in that black pit.

But Roy, as those who have followed his and Peggy's adventures know, was not the boy to weakly give way to despair before he had exhausted every possible hope, and not even then.

But in the darkness he did bitterly reproach himself for falling into the rascals' trap so blindly.

"Well, of all the prize idiots in the world," he broke forth under his breath in the blackness, "commend me to you, Roy Prescott. If you'd thought it over before you started—looked before you leaped—this would never have happened. Anybody but a chump could have seen that, on the face of it, the whole thing was a scheme to entice you away. Oh, you bonehead! You ninny!"

The boy felt better after this outbreak. He even smiled as he thought how neatly he had walked into the spider's web. Then he shifted his position and prepared to think. But, as he moved his foot struck something. A wallet, it felt like; he reached down, and, by dint of feeling about, managed to get his fingers on it.

The leather was still warm, and Roy realized that it must have been dropped into the cellar from the bearded man's pocket when he leaned over to see if Roy had reached the bottom of the ladder.

"Queer find," thought the boy. "I'll keep it. Maybe there's something in it that may result in bringing those rascals to justice."

He thrust it into his pocket and thought no more of it. His mind was busy on other things just then. If only he had a match! He felt in all his pockets without result, and was about giving up in despair, when, in the lining of his coat, he felt several lucifers. They had slipped through a hole in his pocket.

"Gee whiz! How lucky that Aunt Sally forgot to mend that pocket," thought the boy, eagerly thrusting his fingers through the aperture and drawing out a dozen or more matches.

"These may stand me in good stead, now. But I don't want to waste them. Guess I'll just light one to see what kind of a place I'm in, and then trust to the sense of touch if I see any means of escape."

There was a scratch and a splutter, and the match flared bravely. Its yellow rays illumined a cellar very much like any other cellar. It was walled with stonework, well cemented, and there were two or three small windows at the sides. But these, which at first filled Roy with a flush of hope, proved, on examination, to have been bricked up, and solidly, too.

"Nothing doing there," he muttered, and turned his attention to the rear of the underground place where there was a flight of steps leading up to a horizontal door, which, evidently, opened on the outerworld. But this door was secured on the under side by a rusty padlock of formidable dimensions. Roy tried it. It was solid as the Rock of Gibraltar, as the advertisements say.

"Stuck!" he muttered disappointedly; and yet: "Hold on! What about that pocket tool kit I had when I started out on the auto? Hooray! Those chaps forgot to search me. Thought it was too much trouble, I guess. Now for a sharp file! Good! here's one! Now, then, if the luck holds, I'll be free in not much more than a long jiffy!"

These thoughts shot through Roy's brain, as he selected a file from his fortunate find, and began working away at the hasp of the padlock. Above him he could hear the low grumbling growl of the voices of his guardians. But they came very faintly.

"Lucky thing they are in the front room," thought Roy, as he worked on, "otherwise, they might hear this."

At last the file had cut far enough into the hasp for Roy's strong fingers to be able to bend the metal apart. With a beating heart, he replaced the little tool in its case and pulled the ring of the padlock out of the hasp. Then he gave an upward shove, but very gently. For all he knew, the door he was pushing upward might open in another room. But when it gaped, an inch only, Roy saw the faint radiance of a clouded moon. A gust of fresh, clean air blew in his face, as if welcoming him from his noisome depths. An instant later, with throbbing pulses and flushed cheeks, Roy stood out in the open. Above him light clouds raced across the moon, alternately obscuring and revealing the luminary of the night.

But Roy didn't linger. He crept across the field, keeping close to a tall, dark hedge-row till he reached the automobile. As he had guessed, neither of his captors knew how to run it, and it stood just where he had left it.

"Glory be!" thought the boy, climbing in, "I'm all right, now. I don't know where this road goes to, and it's too narrow to turn round, but I'll keep straight on and I'm bound to land somewhere."

He turned on the gasoline and set the spark. But the engine didn't move.

"Queer," thought Roy.

He got out and walked round to the front and then the rear of the car. There was a strong smell of gasoline there. Stooping down, he found the ground was saturated with the fuel. What had happened was plain enough. The cunning rascals who had captured him had drained the tank of gasoline. The auto was as helpless as if it had not had an engine in it at all.

"Well, this is a fine fix," thought Roy. "However, there's nothing for it now, but to keep on. Those ruffians are cleverer than I gave them credit for."

Stealing softly toward the woods, the boy sped into their dark shadows. Aided by the flickering light of the moon, he made good progress through the gloomy depths. He did not dare to slacken his pace till he had traveled at least half a mile. Then he let his footsteps lag.

"Not much chance of their discovering me now, even if they have awakened to the fact that I have escaped," he said to himself, as he strode on.

Suddenly he emerged on a strip of road that somehow had a familiar look. He was still looking about when a strange thing happened.

There came the sound of rapid footsteps approaching him, and the quick breathing of an almost spent runner. Then came a sound as if somebody was scuffling not far from him and suddenly a voice he knew well rang out:

"Prescott, you young scoundrel, I'll get you yet!"

The voice was that of Lieut. Bradbury.

"Well, how under the sun does Lieut. Bradbury know that I'm here?" marvelled the amazed boy, stopping short.

At the same instant, from the direction in which the naval officer's shout had come, a slender dark figure came racing toward him.



CHAPTER XIV.

HOW THEY WORKED OUT.

Roy made a desperate clutch at the figure as it raced past, evidently fleeing from an unseen peril. That that peril was Lieut. Bradbury, Roy did not for an instant doubt, as he could hear the officer's shouts in his undoubted voice close at hand.

The boy's hands grasped the unknown's collar, but at the same instant, with an eel-like squirm, the figure dived and twisted. Suddenly it bent down and scooped up a handful of sandy gravel and flung the stuff full in Roy's face. Blinded, the boy staggered back and the other darted off like a deer.

The next instant two heavy hands fell on Roy's shoulders and he felt himself twisted violently about. And then a voice—Lieut. Bradbury's voice—said:

"Now then, you young rascal, I've got you. What does all this mean?"

"That's just what I'd like to know," exclaimed Roy indignantly, brushing the gravel out of his smarting eyes, "I've been made prisoner and—."

The officer's astonished voice interrupted him.

"What! Do you mean to try to lie out of it? Didn't you just hand the plans of the aeroplane over to that representative of a foreign government whom Mr. Mortlake is now chasing?"

Roy looked at the other as if he thought he had gone suddenly mad, as well he might.

"I don't understand you," he gasped. "What is all this—a joke? It's a very poor one if it is."

"I'll give you a chance to explain," said the officer grimly, tightening his hold on Roy's collar, "as things stand at present, I believe you to be as black a young traitor as ever wore shoe leather."

The world swam before Roy's eyes. He sensed, for the first time, an inkling of the diabolical web that had been spun about him.

But it is time that we retraced our footsteps a little and return to events which occurred after the lieutenant had been picked up by appointment in Sandy Beach. In the automobile which called for him were seated Mr. Harding, whom he already knew slightly from meeting him at the aeroplane plant, and Mortlake himself.

"This is a very unfortunate business, hey?" croaked old Harding, as they spun along the road to the place where Mortlake, who was driving, declared Roy had made an appointment to meet the foreign spy.

"It is worse than that, sir. It is deplorable," the officer had said. And he meant it, too. He had hardly been able to eat his dinner for thinking over the extraordinary situation.

But the auto sped rapidly on. Now it had passed the last scattering houses outside the village, and was racing along a lonely country road. Finally, it turned off, and entered a branch thoroughfare which led from the main track.

All this time but little had been said. Each occupant of the machine was busied with his own thoughts, and in the lieutenant's case, at any rate, they were not of the pleasantest.

The road into which they turned was little more than a track, with a high, grass-grown ridge in the centre. It was a lonesome spot, and certainly seemed retired enough to suit any plotters who might wish to transact their business unobserved.

"Bother such sneaky bits of work," thought the young officer to himself, as they rushed onward through the darkness. "I feel like a cheap detective, or somebody equally low and degraded. It's unmanly, and—oh, well! it's in the line of duty, I suppose, or hanged if I would have anything to do with it. Mortlake showed up as more of a gentleman in the matter than I'd have given him credit for. He seems to be genuinely cut up over the whole nasty mess. Well he may be, too."

As described in another chapter, the sky was overcast with hurrying clouds, which, from time to time, allowed a flood of moonlight to filter through. By one of these temporary periods of light, Lieut. Bradbury was able to perceive that they were in a sort of lane with high hedges on each side.

Suddenly Mortlake ran the auto through a gap in the hedge at one side of the road, and drove it in among a clump of alders, where there was no danger of it being seen.

"This is the place," said he, as they came to a standstill.

"And a nice, lonely sort of place, too, hey?" chirped old Harding; "just the place for a traitor to his country to——"

"Hush!" said the young officer seriously. "Let us wait and see if young Prescott completes the case against himself before we condemn him, Mr. Harding."

"Humph!" grunted the old money-bags. "In my opinion, he is condemned already. Never did like that boy, something sneaky about him. Hey, hey, hey?"

The officer's heart was too sick within him to answer. He drew out his watch and looked at it in a fleeting glimpse of moonshine. It was almost the time that Mortlake had declared had been agreed upon for the consummation of the plot.

"At all events, I shall know within a few minutes if this story is to be credited or condemned," thought Lieut. Bradbury.

Old Harding and Mortlake, the latter leading and beckoning to Lieut. Bradbury, slipped cautiously through the alders, and took up a position in the clump at the edge of the road behind a big bowlder, where they could command a good view of the thoroughfare without being seen themselves. The officer, with a keener sense than ever of doing something dishonorable, joined them.

"Hark!" exclaimed Mortlake presently.

But, although they all strained their ears, they could hear no sound except the cracking of a tree limb, as it rubbed against another branch in the night wind.

"You are sure this was the place?" asked the officer.

"So my man told me," rejoined Mortlake. "You know, I relied absolutely on his word for this thing, all the way through. I, myself, know nothing of it."

He emphasized these last words, as if he wished them to stick in his hearer's memory.

Suddenly, however, a new sound struck into the silence.

It was a heavy footstep, gradually drawing closer. Round the dark corner of the road came a tall form in a long coat and with a slouch hat pulled down well over its eyes.

Lieutenant Bradbury could have groaned. Mortlake nudged him triumphantly.

"Well," he said, "I guess part of it's true, anyhow."

"I'm afraid so," breathed the officer.

"I thought so. Hey, hey, I thought so," chuckled old Harding rustily.

The tall figure came on until it was almost opposite the bushes where the three hidden onlookers were concealed. It looked about in some impatience, tapping one of its feet querulously. Then it fell to pacing up and down.

"Evidently the boy is late," thought the lieutenant. And then a glad guess shot through his mind. "Perhaps the boy has thought better of it."

But even as he felt a great sense of relief at this supposition, there came a low whistle from farther down the road. It was answered by the figure opposite the hidden party, which instantly stopped its pacing to and fro.

"By the great north star, it's true!" gasped the officer, as, from round the bend in the road below where they were stationed, a slight, boyish figure, walking rapidly, came into view. It hesitated an instant, and then, perceiving the tall man, it came on again.

"Have you got der plans?"

The question came in a thick, guttural, foreign tone, from the tall figure.

The boy, who had just appeared, showed every trace of agitation.

"He's struggling with his better nature," thought Lieut. Bradbury. "I'll help him."

He was starting forward with this intention, when Mortlake, prepared for some such move, dragged him back.

"Don't interfere," he whispered, "if the lad is a traitor, as well know it now as at some future time."

Lieut. Bradbury could not but feel that this was true. He sank back once more, watching intently, breathlessly, every move of the drama going on under his eyes.

With a quick gesture, the boy seemed to cast aside his doubts. He muttered something in a low voice, and, as a ray of moonlight filtered through a cloud, Lieut. Bradbury distinctly saw him pass something to the tall man.

"Goot. You haf done vell. Here is der money," said the man, in a low, but distinct tone, that carried plainly to the listeners' ears.

He held out an envelope, which the boy took, with a muttered words of thanks, seemingly.

Lieut. Bradbury could control himself no longer. Flinging Mortlake aside, as if he had been a child, he flashed out of his place of concealment, mad rage boiling over in his veins.

What he had just seen had swept every doubt aside. His whole being was bent on getting hold of the young traitor and trouncing him within an inch of his life. He felt he would be fulfilling a sacred duty in doing so.

But, as he sprang forward, as if impelled by an uncoiled steel spring, the two conspirators caught the alarm. While the officer was still rushing through the bushes, they dashed off, one in one direction, one in the other.

"He's ruined everything," groaned Mortlake.

"No, no; you can save the day yet if you act quickly," cried old man Harding in the same low, intense voice, "shout out that you are after the spy."

"Right!" cried Mortlake, clutching at a straw.

He, too, dashed out of concealment, and took off after the tall man, bellowing loudly:

"You chase the boy, Bradbury. I'll get the spy. Stop you villain! Stop!"

It was at that moment that Roy, just emerging from the woods, heard Lieut. Bradbury's angry challenge:

"Prescott, you young scoundrel, I'll get you yet!"



CHAPTER XV.

WHAT MORTLAKE DID.

"Look here," cried Roy, indignantly wiggling in the officer's strong grasp, "can't you see that this is all a mistake? If you hadn't grabbed me, I could have caught that impostor."

A great light seemed to break on Lieut. Bradbury.

"Why, bless my soul," he exclaimed, "that's so. I can see it all, now. That chap who got away wore a gray suit, while yours is a blue serge, isn't it?"

"It was, before I was thrown into that cellar," said Roy ruefully.

The moon was shining brightly now, and he saw that, in the semi-darkness, it would have been easy to mistake his blue serge, dust-covered as it was, for one of gray material.

"Tell me exactly what has happened," urged the officer. "I must confess I am in a mental whirl over to-night's happenings."

Roy rapidly sketched the events leading up to his capture and imprisonment, not forgetting to lay the blame on himself for being so gullible as to be led into such a pitfall.

"Not a word more of self-blame, my boy," cried the young officer warmly. "Older persons than you would have stumbled into such an artfully prepared snare, baited as it was with the hope of catching Mortlake in a plot to destroy your aeroplane. But now I'm going to tell you my experiences, and we can see if they dovetail at any point."

But when Lieut. Bradbury concluded his narrative, they were still at sea as to the main instigator of the plot. Of course, the finger of suspicion pointed pretty plainly to Mortlake, but the rascal had covered his tracks so cleverly that neither Roy nor the young officer felt prepared to actually accuse him.

"But I can't see how an ordinary workman would have had either the brains or the motive to direct such an ingenious scheme to discredit me in your eyes," concluded Roy, as they finished discussing this phase of the question.

"Nor I. But hark! Somebody's shouting. It must be Mortlake. Yes, it is. Hull—o—a!"

"Hullo—a!" came back out of the night.

"Come, we will retrace our steps to the auto and meet him there," said the lieutenant.

"I wonder if he'll have the face to brazen it out?" thought Roy, by which it will be seen that his mind was pretty well made up as to the "power behind" the night's work.

"Couldn't come near the fellow," puffed Mortlake, as they came up. "He ran like a deer. But—great Christmas—you've had better luck, I see!"

For an instant, even in the semi-darkness, Roy saw the other's face grow white as ashes.

"He thinks that Lieut. Bradbury has caught my impersonator," was the thought that flashed through the boy's mind.

But the same sudden radiance that had betrayed Mortlake's agitation also showed him that it was the real Roy Prescott he was facing. Instantly he assumed a mask of the greatest apparent astonishment.

"Roy Prescott, I am really amazed that you should be implicated in such a——"

"Save your breath, Mr. Mortlake," snapped out the lieutenant, and his words came sharp as the crack of a whip; "this is the real Roy Prescott, and he has been the victim of as foul a plot to blacken an honest lad's name as ever came to my knowledge. The young ruffian who impersonated him to-night has escaped."

"Escaped!" exclaimed Mortlake, but to Roy's quick ears, despite the other's attempt to disguise his relief, it stood out boldly.

"Yes, escaped. Partly owing, I confess, to my overzealousness. There has been foul play here somewhere, Mr. Mortlake."

The officer's voice was stern. His eye flashed ominously. Just then old Mr. Harding came puffing up.

"Oh, so you got the boy, hey?" he cackled, but Mortlake shut him off with a quick word.

"No. This is the real Roy Prescott. It seems that a trick has been put up on us all. The lad we mistook for Roy Prescott was some one impersonating him. This lad has been the victim of a vile plot. While we were watching here for his supposed appearance and the revelation of his treachery, some rascals had locked him in a cellar."

The lieutenant's words were hot and angry. He felt that he was facing two clever rascals, whose cunning was too much for his straightforward methods.

"You—you amaze me!" exclaimed old Mr. Harding, looking in the moonlight like some hideous old ghoul. "What game of cross-purposes and crooked answers is this?"

"That remains to be seen. I shall see to it that an investigation is made and the guilty parties punished."

Was it fancy, or did Roy, for a second, see Mortlake quail and whiten?

But if the boy had seen such a thing, the next instant Mortlake was master of himself.

"It seems to me to have been a plot put up by my workmen," he said. "If I find it to be so, I shall discharge every one of them. Poor fellows, in their mistaken loyalty to me, perhaps they thought that they were doing me a good turn by trying to discredit my young friend—I am proud to call him so—my young friend, Prescott."

For the first time, Roy was moved to speak.

"I hardly think that your workmen were responsible, Mr. Mortlake," he said slowly and distinctly.

"You do not? Who, then?"

"I don't know, yet, but I shall, you can depend upon that."

"Really? How very clever we are. Smart as a steel trap, hey?" grated out old Harding, rubbing his hands. "Smart as a steel trap, with teeth that bite and hold, hey, hey, hey?"

"Instead of wasting time here, I propose that we at once go to the house in which Roy was confined, and see if we can catch the rascals implicated in this," said Lieut. Bradbury. "Can you guide us, my boy?"

"I think so, sir. It's not more than half an hour's tramp from here," said Roy. "Let's be off at once, otherwise they may escape us."

"Ridiculous, in my opinion," said Mortlake decisively. "Depend upon it, those ruffians have found out by now how cleverly the boy escaped them, and have decamped. We had much better get back to town and notify the police."

"I beg your pardon, but I differ from your opinion," said the naval officer, looking at the other sharply. "Of course, if you don't want to go——"

"Oh, it isn't that," Mortlake hastened to say. "I'm willing, but Mr. Harding. He is old, and the night air——"

"Mr. Harding can remain with the automobile. There are plenty of wraps in it. Come, Roy. Are you coming, Mr. Mortlake?"

"Yes, oh, yes. Mr. Harding, you will make yourself comfortable till we return."

Having said this, Mortlake came lumbering after the other two, as eagerly as if his whole soul was bent on capturing the two men who had been carrying out his orders.

"I've got a revolver ready for them," he volunteered, as the party plunged through the woods along the little track Roy had followed.

"Take care it doesn't go off prematurely and alarm them," said the officer. "We don't want to let them slip through our fingers."

"Of course not; I'll be very careful," promised Mortlake.

They trudged on in silence. Suddenly Roy halted.

"We're near to the place now," he said.

"Advance cautiously in single file," ordered the lieutenant. "I'll go first."

In Indian file, they crept up on the house. Its outlines could now be seen, and in one window a ruddy glow from the lamp the two abductors of Roy had kindled. Evidently they had not yet discovered his escape.

All at once Mortlake, who was last, stumbled on a root and fell forward; as he did so, his revolver was discharged twice. The shots rang out loudly in the still night.

Instantly the light was extinguished. The next instant two dark figures could be seen racing from the house. Before Lieut. Bradbury could call on them to halt, they vanished in the darkness and a patch of woods to the north.

"What a misfortune!" exclaimed Mortlake contritely, picking himself up.

Lieutenant Bradbury could hardly restrain his anger.

"How on earth did you happen to do that, Mortlake?" he snapped. "Those two shots alarmed those rascals, and now they're gone for good. It's most annoying."

"I appreciate your chagrin, my dear Bradbury," rejoined Mortlake suavely, "but accidents will happen, you know."

"Yes, and sometimes they happen most opportunely," was the sharp reply.

Mortlake said nothing. In silence they approached the house, but nothing save the pack of greasy cards, was found there to indicate the identity of its late occupants.

There was nothing to do but to return to the automobile. They found old Mr. Harding awaiting them eagerly. He showed no emotion on learning that Roy's captors had escaped just as their capture seemed certain.

On the drive back to Sandy Beach, the old banker and Mortlake occupied the front seat, while Roy and Lieut. Bradbury sat in the tonneau. As they skimmed along, Roy drew something from his pocket and showed it to the officer. It was an object that glistened in the wavering moonlight.

"It's a woman's hair comb!" cried the officer in amazement, as he regarded it.

"Hush, not so loud," warned Roy. "I picked it up where I had the struggle with the other Roy Prescott. It may prove a valuable clue."



CHAPTER XVI.

MISSING SIDE-COMB.

Some days after the strange and exciting events just recorded, Peggy burst like a whirlwind into the little room,—half work-shop, half study,—in which Roy was hard at work developing a problem in equilibrium. It was but a short time now to the day on which they were to report to the navy Board of Aviation at Hampton Roads, and submit their aerial craft to exhaustive tests. Both brother and sister had occupied their time in working like literal Trojans over the Golden Butterfly. But although every nut, bolt and tiniest fairy-like turn-buckle on the craft was in perfect order, Roy was still devoting the last moments to developing the balancing device to which he mainly pinned his hopes of besting the other craft.

From the newspapers they had been made aware that several types, bi-planes, monoplanes and freak designs were to compete, and Roy was not the boy to let lack of preparation stand in the way of success. Detectives and the local police had been set to work on the mysterious plot whose object had been to entrap the boy. But no result had come of their work. Incidentally, it had been found, when the auto which Roy had driven to the deserted house was towed back for repairs, that the tank had been punctured by some sharp instrument.

As for the clue of the brilliant-studded comb, Peggy on examining it, declared it to be one of a pair of side-combs, which only complicated the mystery. Roy had thought of surrendering this clue to the police, but on thinking it over he decided not to. He had an idea in regard to that comb himself, and so had Peggy, but it seemed too wild and preposterous a theory to submit to the intensely practical police of Sandy Beach.

Roy looked up from the paper-littered desk as Peggy flung breathlessly into his sanctum. He knew that only unusual news would have led her to interrupt his work in which she was as keenly interested as he was.

"What is it, Sis?" he asked, "you look as excited as if the Statue of Liberty had paid us a visit and was now doing a song and dance on the front lawn."

"Oh, Roy, do be serious. Listen—who do you suppose has come back to Sandy Beach?"

"Not the least idea. Who?"

"Fanning Harding!"

"Fan Harding! The dickens!"

"Isn't it, and more than that, he is down at the Mortlake plant now. He is going to take up the Cobweb. And who do you think is to be his companion?"

"Give it up."

"Regina Mortlake!"

"Phew!" whistled the boy, "a new conquest for the irresistible Fanning, eh?"

"Don't be stupid," reproved Peggy, severely, "I've been thinking it over and I've just hit on the solution. Fanning, or so I heard, took up aviation when he was in the west. You know he always had a hankering for it."

"Yes, I recollect his fake aeroplane that scared the life out of you," grinned Roy.

"Well," pursued Peggy, not deigning to notice this remark, "I guess they decided that Mr. Mortlake would be a bit er—er—overweight isn't it called? so they sent for old Mr. Harding's son to manage the Cobweb at the tests."

"Jove, that must be it. Makes it rather awkward, though. Somehow I don't much fancy Master Fanning."

"As if we hadn't good reason to despise him. Hark! there goes the Cobweb now!"

A droning buzz was borne to their ears. Running to the window they saw the Mortlake aeroplane whiz by at a fair height. It was going fast and a male figure, tall and slight, was at the wheel. In the stern seat Regina Mortlake's rubicund aviation costume could be made out.



"Fanning has certainly turned out to be a good driver of aeroplanes," commented Roy, as he watched; "see that flaw strike them! There! he brought the Cobweb through it like an old general of the upper regions."

Peggy had to admit that Fanning Harding did seem to be an expert at his work; but she did it regretfully.

"He gives me the creeps," she volunteered.

"There's nothing creepy about his aeroplane work, though," laughed Roy, "I shouldn't have believed he could have picked up so much in such a short time."

But a bigger surprise lay in store for the young Prescotts. That afternoon they had, as visitors, no one less than Fanning Harding and Regina Mortlake. While Peggy and the daughter of the designer of the Mortlake aeroplane chatted in one corner, Fanning placed his arm on Roy's shoulder and drew him out upon the veranda where Miss Prescott sat with her embroidery.

"I know you don't like me, Roy, and you never did," he said insinuatingly, "but I've changed a lot since I was in Sandy Beach before. Let's let bygones be bygones and be friends again. More especially as in a few days we'll be pitted against each other at the naval tests."

"Of course, if you are genuinely sorry for all the harm you tried to do us, I've nothing more to say," said Roy, "I'm willing to be friends, but although I may forgive, it's going to be hard to forget."

"Oh, that will come in time," said Fanning, airily, "I'm a changed fellow since I went west."

But in spite of Fanning's protestations Roy could not help feeling a sensation of mistrust and suspicion toward the youth. There was something unnatural even in this sudden move toward friendship.

"It's ungenerous, ungentlemanly," Roy protested to himself; but somehow the feeling persisted that Fanning was not to be trusted.

"How prettily you do your hair," Peggy was remarking to Regina Mortlake in the meantime.

She looked with genuine admiration at the glossy black waves which the other had drawn back over her ears in the French style.

"Oh, do you like it?" asked Regina eagerly, "I think its hideous. But you know I lost one of my combs and—but let's go and see what the boys are doing," she broke off suddenly, turning crimson and hastening to the porch. Once outside she plunged at once into conversation with the two boys, and Peggy had no opportunity of picking up the dropped stitches of conversation. She caught herself puzzling over it. Why had Regina been so mortified, and apparently alarmed, when she had announced the loss of one of her side-combs? Right there a strange thought came into Peggy's mind. The brilliant-studded comb that Roy had picked up! Could it be that—but no, the idea was too fantastic. In the pages of a book, perhaps, but not in real life. And yet—and yet—Peggy, as she watched the graceful, dark-eyed girl talking with splendid animation, found herself wondering—and wondering.

The next day, just as Peggy and Roy were starting out for a run to the Bancroft place, Fanning Harding and Regina Mortlake came whizzing up to the gate in the latter's big touring car—the one in which she had arrived in Sandy Beach. The machine was the gift of her father. It was a commodious, maroon-colored car, with a roomy tonneau and fore-doors and torpedo body of the latest type.

Beside it the Blue Bird looked somewhat small and insignificant. But Roy and Peggy felt no embarrassment. On the contrary, they were quite certain the Blue Bird was the better car.

"Where are you off to?" asked Fanning in friendly tones, while Regina bowed and smiled very sweetly to Peggy.

"Going to take a spin in the direction of the Bancroft's," said Roy, starting his car.

"What fun," cried Regina Mortlake, "so are we. Let's race."

"I don't believe in racing," rejoined Peggy.

"No, of course it is dangerous," said Fanning, "I guess Roy is a bit timid with that old car, too. Besides it's all in the way you handle a machine;"

Roy flushed angrily.

"I guess this 'old car,' as you call it, could give yours a tussle if it comes down to it," he said sharply.

Peggy tugged his sleeve. She saw where this would lead too. She saw, too, that Fanning was anxious to provoke Roy into a race. Presumably he was anxious to humiliate the boy in Regina Mortlake's eyes.

"Well, do you want to race then?" asked Regina, provokingly, her fine eyes flashing, "there's a bit of road beyond here that's quite broad and one hardly ever meets anything."

Now Roy was averse, as are most boys, to being thought a "'fraid cat," and the almost openly taunting air with which the girl looked at him angered him almost to desperation.

"Very well," he said, "we'll race you when we get to that bit of road."

"Oh, Roy, what are you saying," pleaded Peggy, "it's all a trick to humiliate us. The Blue Bird can't possibly keep up with their car, and——." But Roy checked her impatiently.

"You don't think I'm going to allow Fanning Harding to scare me out of anything, do you?" he demanded in as near to a rough tone of voice as he had ever used to his sister.

Poor Peggy felt the stinging tears rise. But she said nothing. The next moment the cars began to glide off, running side by side on the broad country road. Faster and faster they went. The speed got into Roy's head. He began to let the Blue Bird out, and then Fanning Harding, for the first time seemingly, realized what a formidable opponent he was placed in contact with.

As they reached the bit of road previously agreed upon as a race course, the banker's son stopped his machine and hailed Roy to do the same.

"Tell you what we'll do to make this interesting," he said, "we'll change machines. Or are you afraid to drive mine?"

"I'll drive it," said Roy recklessly, in spite of Peggy's quavered: "Say no."

"Good. That will give us a fine opportunity to compare the two machines," cried Fanning Harding.

He jumped from the bigger car and handed out his companion. Then, for the fraction of a minute, he bent, monkey wrench in hand, above one of the forward wheels.

"A bolt had worked loose," he explained.

"Come on Peggy," urged Roy, and against her better judgment Peggy, as many another girl has done before her, obeyed the summons, although an intuition warned her that something was not just right.

"Ready?" cried Fanning from the Blue Bird.

"All ready"; hailed back Roy, who found the spark and throttle adjustments of the maroon car perfectly simple.

"Then—go!" almost screamed Regina Mortlake. Peggy was looking at her at the moment, and she was almost certain she saw a look of hatred flash across the girl's countenance. But before she could give the matter any more thought the maroon car shot forward. Close alongside came the Blue Bird.

Motor hood to motor hood they thundered along at a terrific pace. The road shot by on either side like a brown and green blur.

"Faster!" Peggy heard Fanning shout somewhere out of the dust cloud.

Whi-z-z-z-z-z-z! It was wild, exciting—dangerous!

"Roy," gasped Peggy, "if——"

But she got no further. There was a sudden soul-shaking shock. The front of the car seemed to plough into the ground. A rending, splitting noise filled the air.

The car stopped short, and its boy and girl occupants were hurtled, like projectiles, into the storm center of disaster.



CHAPTER XVII.

JIMSY'S SUSPICIONS ARE ROUSED.

Peggy, after a moment in which the entire world seemed spinning about her crazily, sat up. She had landed in a ditch, and partially against a clump of springy bushes, which had broken the force of her fall. In fact, she presently realized, that by one of those miraculous happenings that no one can explain, she was unhurt.

The automobile, its hood crushed in like so much paper, had skidded into the same ditch in which Peggy lay, and bumped into a small tree which it had snapped clean off. But the obstacle had stopped it.

One wheel lay in the roadway. Evidently it had come off while the machine was at top speed, and caused the crash. But Peggy noted all these things automatically. She was looking about her for Roy.

From a clump of bushes close by there came a low groan of pain. The girl sprang erect instantly, forgetting her own bruises and shaken nerves in this sign that her brother was in pain. In the meantime, Fanning and Regina Mortlake had stopped and turned the Blue Bird. They came back to the scene of the wreck with every expression of concern on their faces.

Roy lay white and still in the midst of the brush into which he had been hurled. There was a great cut across his forehead, and in reply to Peggy's anxious inquiries, the lad, who was conscious, said that he thought that his ankle had been broken. Peggy touched the ankle he indicated, and light as her fingers fell upon it, the boy uttered an anguished moan.

"Oh, gee, Peg!" he cried bravely, screwing up his face in his endeavor not to make an outcry, "that hurts like blazes."

"Poor boy," breathed Peggy tenderly, "I'm so sorry."

"I'm so glad you're not hurt, Sis," said the boy, "I don't matter much. I wish you could stop this bleeding above my eye, though."

Peggy ripped off a flounce of her petticoat and formed it into a bandage.

"Can I help. I'm so sorry."

The voice was Fanning Harding's. He stood behind her with Regina at his side.

"Oh, how dreadful." exclaimed the dark-eyed girl, with a shudder, "my—my poor car."

"And my poor brother," snapped out Peggy, indignantly, "if it hadn't been for your stupid idea of racing this wouldn't have happened. I just knew we'd have an accident."

"It's too bad," repeated Fanning, "but can't I do something?"

"Yes, get me some water. There's a brook a little way down this road. You'll find a tin cup under the rear seat in our machine."

Fanning, perhaps glad to escape Peggy's righteous anger, hastened off on the errand. Regina flounced down on a stone by the roadside and moaned.

"Oh, this is fearful. Why can't we get a doctor? Oh, my poor car. It will never be the same again."

"Nonsense," said Peggy, sharply, "it can easily be repaired. But you don't think I'm worrying about your car now, do you?"

"I don't know, I'm sure," quavered Regina, "I know it's all terrible. Is your brother badly hurt?"

"No. Fortunately he only has this cut in his head and a broken ankle. It might have been far worse."

Regina wandered away. Somehow she felt that Peggy had taken a sudden dislike to her. She sauntered toward the car. Suddenly she stopped and her large eyes grew larger. In the middle of the road, just as they had been hurled from Roy's pocket, lay a side-comb studded with brilliants and an old battered wallet.

"Oh!" cried the girl, with an exclamation that was half a sob, "oh, what good fortune. So he was keeping that as evidence against me, eh? Well, perhaps this accident was providential, after all."

She picked up the comb and then turned her attention to the wallet. Giving a quick glance around to see that she was unobserved the girl plunged her white fingers into the pocket case. They encountered something crisp and crackly. She drew the object out.

"A twenty-dollar bill!" she exclaimed wonderingly, "and nothing else. I wonder if this can have anything to do with——."

She was turning it over curiously as she spoke. Suddenly a red spot flamed up in her either cheek.

"It's marked with a red round O," she exclaimed, "what a bit of evidence. So Master Roy Prescott, you were planning to unmask me by that side-comb, were you? Well, I shall play the same trick on you with this bill."

Fanning Harding was coming back at that moment with the cup full of water. The girl checked him with an excited gesture.

"Fortune has played into our hands," she cried, "look here!"

"Well, what is it?" asked Fanning, rather testily.

"This bill. Don't you see it's one of the stolen ones. Look at the red circle upon the back."

"Jove! So it is. But, what, how——"

"Hush! Don't talk so loud. This wallet, which contained it, was jolted out of Roy Prescott's pocket when he was hurled from the machine. The wallet and—and something else. But don't you see what power that gives us?"

"No. I confess I'm stupid, but——"

"Oh, how dense you boys are," exclaimed Regina, with an impatient stamp of the foot, "don't you see that this bill will come pretty close to proving Roy Prescott a thief, if we want to use it that way? You are a witness that I found it in his wallet which had been jerked out of his pocket. Isn't that enough?"

"Well, men have been sent to prison on less evidence," said Fanning, with a shrug; "but I've got to hurry up with this water or they'll suspect something. I'll talk more with you about this later on. Your father and mine need every bit of fighting material they can get hold of, if we are to win the big prize for the Mortlake aeroplane."

A shadow fell athwart the road as Fanning, an evil smile on his flabby, pale face, hastened down into the depression in which Roy, with Peggy bending above him, still lay. The girl looked swiftly up. A big, red aeroplane was hovering on high. Presently one of its occupants, a girl peered over the edge. The next minute she turned and said something in an excited tone to her companion. The aeroplane began to drop rapidly. In a few seconds it came to earth in the roadway, not a stone's throw from the wrecked auto and its uninjured Blue Bird comrade.

The new arrivals were Jimsy and Jess. They had set out on a sky cruise to the Prescott home, and Jess's bright eyes had espied the confusion in the road beneath them as they flew over. The swift descent had been the result.

Hardly noticing Regina, who regarded them curiously, the young sky sailors hastened toward the spot in which, from on high, they had seen the injured boy lying. A warm wave of gratitude swept over Peggy as she looked up at the sound of footsteps and saw who the newcomers were. In an emergency like the present one she could not wish for two better helpers than the Bancrofts.

Jess and Jimsy had been off on a visit and so had not been made aware of the fact that Fanning had returned to Sandy Beach. Their astonishment on seeing him may be imagined. Jess regarded him with a tinge of disdain, but the frank and open Jimsy grasped the outstretched hand which the son of the Sandy Beach banker extended to him. Evidently Fanning's policy was one of conciliation and he meant to press it to the uttermost.

"Well, this is a nice fix, isn't it?" murmured Roy, smiling pluckily, as the Bancrofts came toward him with pitying looks, "but where in the world did you come from?"

"From yonder sky," grinned Jimsy, trying, not very successfully, to assume an inanely cheerful tone, "not badly hurt, old man, are you?"

"No. Just this wallop over my eye and a twisted ankle. Thought it was broken at first, but I guess it isn't."

"How did it all happen?"

Peggy explained. Jimsy whistled.

"What make of machine is your car, Fanning?" he asked.

"A Dashaway," was the rejoinder.

"The same type as ours," exclaimed young Bancroft. "They are the best and stanchest cars on the market. I can't understand how such an accident could have happened, unless——," he paused and then went on resolutely, "unless the car had been tampered with."

"What an idea!" shrilled Regina, who had now joined the group, "you don't surely mean to insinuate? Why the damage done to my poor machine will cost a lot to repair, and——."

"Don't mind if I have a look at it, do you?" asked Jimsy in his most careless manner, "I'm interested, you know. A motor bug is what dad calls me."

"Well I——," began Fanning.

But Regina interrupted him with strange eagerness.

"Oh, by no means. Look at it all you wish. I only hope you can find some explanation for this regrettable accident."

"I hope so, too," said Jimsy gravely, "but in the meantime let's make Roy comfortable in the Blue Bird. Then, if we can fix your car up, Miss——."

"Oh, I beg your pardon," struck in Peggy, "Jimsy, this is Miss Mortlake, Fanning you know. Miss Mortlake these are our particular chums, Jess and Jimsy Bancroft."

"Indeed. I have heard a great deal about you," vouchsafed Regina, as Jimsy and Fanning lifted Roy and carried him to the Blue Bird and made him comfortable on the cushions.

"I'll attend to the other car," volunteered Fanning, readily. But Jimsy was not to be put off in this way.

"I'd like to have a look at it before we try to put the wheel back," he said; "it may be a useful bit of experience."

"All right," assented Fanning, rather sullenly, "if you insist; but I think we ought to hurry back at once."

"By all means," quoth the bland Jimsy, "but—hullo, what's this!" He was stooping over the wheels now. "This wheel has been tampered with. The holding cap must have been partially unscrewed. Look here!"

He held up the brass cap which was supposed to keep the wheel on its axle.

"Some of the threads have been filed out of this," he said positively.

"Let's have a look," said Fanning eagerly. He leaned over and scrutinized the part which Jimsy was examining.

"Those threads haven't been filed," he said, "they've worn. Very careless not to have noticed that. It's surprising that it held on so long."

"It might have held for a year if the car was run at average speed," said Jimsy slowly, "but the minute it was raced beyond its normal rate the weak part would have gone."

"What do you mean to imply?" blustered Fanning, though his face was pale and his breath came quickly.

"I don't imply anything," said Jimsy slowly, "but I'd like to know who filed this cap down."

"Pshaw! You are dreaming," scoffed Fanning.

A dull flush overspread Jimsy's ordinarily placid face.

"After a while I'll wake up, maybe," he said, "and then——." He stopped.

"Well, let's see about getting Roy home," he said, "Peggy, you can drive the Blue Bird and Fanning and Miss Mortlake can sit in the other machine as soon as we get the wheel back. Then Jess and I will go ahead in the Red Dragon Fly and break the news to Miss Prescott."

Shortly thereafter the two autos moved slowly off, while the aeroplane raced above them, going at a far faster speed.

Regina turned to Fanning.

"Do you think that odious boy suspects anything?" she asked.

"I guess he does. But he can't prove a thing, so that's all the good it will do him," scoffed Fanning, "and besides, if they get too gay we've got a marked bill that will make it very unpleasant for a certain young aviator."



CHAPTER XVIII.

A BOLT PROM THE BLUE.

The broken ankle which both Peggy and Roy had dreaded, turned out to be only a sprain—affecting the same unlucky ankle that had been injured on the desert. This was a big relief, as a broken joint would have kept Roy effectually out of the aeroplane tests, as part of the machinery of the Golden Butterfly was controlled by foot pressure.

A council of war was in progress on the porch of the Prescott home. The participants were the inseparable four. Peggy and Roy, the latter with his injured foot on a stool, and Jess and Jimsy. They had been discussing the case against Mortlake and Fanning Harding. All agreed that things looked as black against them as could be, but—where was the proof? There was not an iota of evidence against them that would hold water an instant before impartial judges.

"It's positively depressing," sighed Jess, "to know that people have done mean things and not be able to get an atom of proof against them."

"Never mind," said Peggy, "all's well that ends well. We start for Hampton to-morrow and once there they won't have a chance to try any more tricks. Luckily all their mean plans and schemes have ended in nothing. Roy will be as good as ever by to-morrow, won't you boy?"

Roy nodded.

"I've got to be," he said, decisively; "those tests have got to bring the Golden Butterfly out on top."

"And they will, too," declared Jess, with a nod of her dark head, "that poky old Harding and his crowd won't have a word to say when they are over."

"Let's hope not. It doesn't do to be too confident, you know," smiled Peggy, throwing an arm round the waist of her enthusiastic friend.

"As the man said when he thought he'd lassoed a horse but found he'd roped his own foot instead;" grinned Jimsy, "but, say, what's all this coming up the road?"

Sure enough, a small crowd of ten or a dozen persons could be seen approaching the Prescott house. They were coming from the direction of the Mortlake plant. In advance, as they drew nearer, could be seen Mortlake himself, with a tall man by his side and Fanning Harding. The men behind seemed to be workmen from the plant.

"Wonder where they can be going to?" queried Jess, idly. For a few moments more they watched the advancing throng, and then Jimsy cried suddenly:

"Why, that's Sheriff Lawley with Mortlake, and there's Si Hardscrabble the constable, right behind them, what can they be after?"

"Clues," laughed Peggy, but the laugh faded on her lips as she exclaimed:

"Why—why, they're coming here!"

"Here!" echoed the others.

"Yes, that's what they are;" confirmed Jimsy, as the procession passed inside the wicket gate and came up the gravelled pathway toward the house.

Sheriff Lawley had on his stiffest professional air and Si Hardscrabble's chest was puffed out like a pouter pidgeon. On it glistened, like a newly scoured pie-plate, the emblem of his authority—an immense nickel star as big as a sunflower.

"Roy Prescott here?" demanded the sheriff in a high, official tone. He had known Roy since he was a boy, but seemed to think it a part of his majestic duties to appear not to know him.

"Miss Prescott—I—that is—er—this is a very unpleasant business—I hope——."

It was Mortlake stammering. He mopped the sweat from his forehead as the sheriff interrupted him.

"That will do Mr. Mortlake. Leave the discharge of my official duties to me, please."

"That's right, by heck," chorused the constable, approvingly.

"What's the matter, sheriff?" asked Roy, easily. As yet not a glint of the truth of this visit had dawned upon him.

"Why, Roy, it's about that thar robbery at Galloways t'other night," sputtered the sheriff, looking rather embarrassed, "we've come to the conclusion that you know more about it than you told, and——," he dived into a pocket and drew out an official-looking paper, "an' I got a warrant fer your arrest."

"My arrest!" stammered Roy, "why you must be mad. What on earth do I know about it?"

"Nothin', only you happened to hev' a marked bill in your pocket t'other day," shot out the sheriff, triumphantly. "Fanning Harding step forward. What do you know about this?"

"Only this, that Miss Regina Mortlake after the automobile accident found a wallet belonging to Roy Prescott in the roadway. She opened it and discovered that it contained a marked twenty-dollar bill answering the description of one of the bills stolen from the Galloway farm house. She made me a witness of the find, and in line with my duty as a citizen, I thought it best to expose the thief, and——."

Fanning stopped and turned pale as a boyish figure sprang toward him with doubled fists. He shrank back, turning a sickly yellow.

"You contemptible sneak!" shouted Jimsy, whose fists it had been that threatened Fanning.

"Sheriff, I claim protection," said the cowardly youth, shrinking behind the official.

"Now, no fisticuffs here," warned the sheriff, "my only duty now is to preserve order and arrest Roy Prescott on a charge of grand larceny."

Peggy turned white and sick. The veranda floor seemed to heave up and down like sea waves under her feet. But in the next few seconds she regained control of herself.

"Why such a charge is absurd," she declared vehemently, "this is simply spite on the part of our rivals in the aeroplane business."

"Don't know nuthin' about that," reiterated the sheriff, stolidly, "the warrant has bin sworn out an' it's my duty ter execute it. Constable, arrest that boy. Ef his foot is too bad hurt to walk, git a rig an' drive him in ter town."

Hardscrabble, flushed and swollen with importance, stepped forward. He was about to place his hand on Roy's shoulder, but the boy checked him.

"No need for that. Peggy, if you'll have them get out the auto, we'll drive into town at once."

Mortlake stepped forward.

"Prescott," he said, "I hope you don't hold this against me. I——."

"I don't wish to speak to you, sir," shot out Roy, for the first time betraying indignation, "let that be your answer."

"But I—really, I'm sorry to—Bancroft you'll listen——"

But Jimsy turned his back on the flushed, overfed man whose eyes could not look him in the face.

"In the future please do us the honor not to speak to us," he said, his voice vibrant with anger.

"Why, if I may ask?"

Jimsy flashed round.

"Because, if you don't pay attention to my request I'm afraid I shall be unable to curb my desire to land both my fists in your eyes."

Mortlake drew back and turned away among his workmen. He did not speak again.

Before long the auto came round. In the meantime Peggy had taken upon herself the task of consoling Miss Prescott. Poor Aunt Sallie, she took the news very hardly. It was all Peggy could do to keep her from rushing out upon the porch and denouncing the entire assemblage.

"That Mortlake," she cried, "I'd like to scratch his eyes out."

The proceedings in Sandy Beach before the local magistrate, Ephraim Gray, were brief. Isaac Galloway, the farmer, told of the robbery and of his knowledge that the marked bill was among the money. He followed this up by relating the fact that Roy had been in the house in the afternoon and had seen the safe.

Then came Fanning, and to the girl's astonishment, Regina Mortlake, both of whom swore to finding the marked bill in the wallet in the road.

"Do you deny that this was your wallet?" asked the magistrate, holding up the leather case after he had examined the marked bill.

"I do," declared Roy in a firm voice.

"What! you did not drop it?"

"I dropped it, but it is not mine," was the stout reply.

"Then what was it doing in your possession?"

"Do I have to answer that question, now?"

"It will be better to—yes."

"Well, then, I found it in the cellar of a house to which I was lured by two men whom I am confident were employed by this hound Mortlake."

"Be careful," warned the magistrate, "Mr. Mortlake is a respected member of this community. Your display of ill-will does you no good. As for your story of how you found the wallet you can tell that to a jury later on. My present duty is to hold you in bonds of $2,500 for trial."

A deep breath, like a sigh, went through the courtroom. In the midst of it an active, upright figure stepped forward. It was Lieut. Bradbury, who had arrived in the courtroom just in time to hear the concluding words. But he had already been informed of the facts, for the story was on every tongue in the village.

"I am prepared to offer that bail," he said.

But Peggy had been before him. With her mine shares she had a good bank account and was able to offer cash security. This was accepted almost before the young officer reached the judge's desk. Peggy thanked the lieutenant with a look. She could not trust herself to speak.

"Of course," said the magistrate, "the fact that the defendant is under bonds will prohibit his leaving the state. That is understood."

Mortlake nudged Fanning Harding. This was what they had cunningly calculated on. With Roy safely bottled up in New York state, it would be manifestly impossible for him to take part in the contests at Hampton in Virginia. While they conversed in low, eager tones, Peggy and Lieutenant Bradbury could be seen talking in another corner. Court had been adjourned, but the curious crowd still lingered. Jess and Jimsy stood by Roy, fencing off the inquisitive villagers and would-be sympathizers. The whole thing had taken place so rapidly that they all felt dazed and bewildered. Suddenly the thought of what his detention meant dawned upon Roy.

"We'll be out of the race for the naval contracts," he almost moaned.

It was the first sign he had shown of giving way. But Peggy was at his side in an instant.

"No, we won't, Roy," she exclaimed, her eyes brilliant with excitement, "I've asked Lieutenant Bradbury, and he says it's unusual, but he doesn't see why a woman should be barred from flying in the contests. There's nothing in the rules about it, anyway."

"Oh, Peg—gy!" gasped Jess, "you would——"

"Do anything within reason to balk that Mortlake crowd in their trickery and deceit," declared Peggy, with flashing eyes.

"And we'll stand by you," announced Jimsy, stepping forward; "we'll go with you to Hampton, and we'll bring home the bacon!"

The inexcusable slang went unreproved. Jimsy's enthusiasm was contagious.

"Thank you, Jimsy," said Peggy, winking to keep back the tears that would come, "we—we—I—that—is——"

"We'll beat them out yet. The bunch of sneaks, and it's my opinion that Mortlake himself knows all about who robbed that safe!" cried Jimsy, not taking the trouble to sink his voice.

He faced defiantly about and caught Mortlake's eye. It was instantly averted, and catching Fanning by the arm he hastened from the courtroom.

"I wonder what mischief those young cubs are hatching up now?" he said, as the two hastened off, bending their steps toward old Mr. Harding's bank.

"It doesn't make much difference," chuckled Fanning, "we've got that contract nailed down and delivered now."



CHAPTER XIX.

THE GATHERING OF THE MAN-BIRDS.

The aeroplanes—a dozen in all, that had been selected by various naval "sharps" from all over the widely distributed portions of the country for the weeding out of the best type—were quartered in a broad meadow not far from the town of Hampton. The locality had been chosen as removed from the reach of the ordinary run of curiosity seekers, who had flocked from all parts of the country to be present at the first tests of aeroplanes as actual naval adjuncts.

Sheds had been provided for the accommodation of each type. And above each shed was the name of the aeroplane it housed, printed in small letters. One of the first things that Mortlake and Fanning Harding proceeded to do on their arrival at this "bivouac" was to make a tour of the row of sheds in search of the Prescott machine. But to their joy, apparently, no shed housed it.

There were machines of dozens of other types, monoplanes, bi-planes, machines of the helicopter type, and a few devices based on the parachute principle. But no Prescott. The names the various machines bore were weird: The Sky Pilot, the Cloud Chaser, the Star Bug, the Moon Mounter, the Aerial Auto, the Heavenly Harvester, and some titles even more far-fetched graced the sheds, so that it was small wonder that in this maze of high-sounding names a shed at the far end of the row bearing the obscure title of Nameless missed the scrutiny of Mortlake and his aide.

"We've beaten them to a standstill this time," said Mortlake with intense conviction, "I feel that the Motor Hornet has the contest cinched."

The Motor Hornet was the name that had been bestowed on the machine which Roy had poetically dubbed the Silver Cobweb.

The shed of the mysterious Nameless was the only one of the long row that did not buzz with activity all that day, which was one assigned to preparation for the contests of the morrow. All the other aeroplane hives fairly radiated activity. Freakish-looking men hovered about their weird helicopters and lovingly polished brass and tested engines. The reek of gasolene and burning lubricants hung heavily over the field. Reporters darted here and there followed by panting photographers bearing elephantine cameras and bulging boxes of plates, for the metropolitan press was "playing up" the tests which were expected to produce a definite aerial type of machine for the United States Navy.

But even the most inquisitive of the news-getters failed to get anything from within the mysterious realms occupied presumably by the Nameless. Its roller-fitted double doors remained closed, and no sign of activity appeared about it.

This was conceded on all sides to be extraordinary, but all the speculation which was indulged in failed to elucidate the mystery.

"The Nameless is also the Ungetatable," joked one reporter as he and a companion passed by.

But if anyone had been about late that night, long after the aviators who had quarters at the hotels in town had quitted the field, he would have seen three figures—two girls and a boy, steal across the field from an auto which had driven up almost noiselessly, and unfasten the formidable padlocks on the doors of the Nameless's dwelling place.

This done they vanished within the shed for a short time, and presently thereafter a dark and strangely shaped form slowly emerged from the shed. It was the Golden Butterfly, and the trio of young folks were, as you have already guessed, Peggy, Jess and Jimsy. They crawled noiselessly on board, and a few minutes later, with a soft whirring of the propellers, the Butterfly shut down for precaution's sake to half speed, sped almost noiselessly upward.

The night was a calm one. Hardly a leaf was stirring and the stars shone like steel points in a cloudless sky. The aeroplane, after it had attained a few hundred feet, seemed to merge into the dark background of night sky. Unless one had known of its flight it would have taken a sharp pair of eyes to have discerned it.

"Say, this is glorious. It's like being pirates or—or something," said Jimsy enthusiastically, as soon as they had reached a height where they felt they could talk without difficulty.

"It's great after being penned up all day at that hotel," agreed Peggy, who was at the wheel, "how beautiful the stars are. Poor Roy, I wonder how he is getting along?"

"You know he was doing splendidly when we left, and he has our telegrams by this time," said Jess; "oh, Peggy, I'm so glad that the board of naval aviation said you could fly the Golden Butterfly."

"Oh, weren't they taken aback, though, at the idea?" chuckled Jimsy; "I thought that dignified old officer would fall out of his chair at the idea of a girl daring to run an aeroplane. I'll bet if there'd been anything in the rules about it, Peggy, they'd have barred you."

"I think so, too," laughed Peggy, "but, luckily, there wasn't. As Lieut. Bradbury pointed out, it was a case of an emergency. It isn't as if I'd tried to 'butt in,' as you say, Jimsy."

"Well, I'm sure I don't see why a girl shouldn't run an aeroplane just as well as a boy. You certainly showed that you could, Peggy, when you raced that train back in Nevada."

"In years to come," prophesied Peggy, "I dare say women as aviators will be as common as men. I don't see why not. Ten years ago a woman who ran an automobile would have been laughed at, if not insulted. But now, why lots of women run their own cars and nobody thinks of even turning his head."

"Hear! hear!" cried Jimsy, "I declare I feel like a lone man at a suffragette meeting."

"Then conduct yourself as if you were actually in that dangerous position," laughed Peggy.

The girl's spirits were rising now under the excitement of the night ride. On the advice of Lieut. Bradbury the party from Sandy Beach had kept closely to their rooms at the hotel all that day. It was at the officer's advice, too, that their shed had been labeled the Nameless.

"If Mortlake was, as I begin to think, concerned in these attacks on you," the officer had said, "I think it would be advisable not to appear any more than necessary. Let him think that you are out of the race."

Accordingly, the Butterfly had been transported secretly and placed in her shed at night. The secret had been well guarded and, as we know, neither Mortlake nor Fanning Harding had even an inkling that the Prescott machine was far—very far from being out of the race.

On and on through the night throbbed the Golden Butterfly, making fast time. At last they decided that it was time to return. The object of the trip, to see that all was in running order, had been accomplished. Nothing remained to do now but to wait for the morrow and what it would bring forth. The nature of the tests had been carefully guarded, and not one of the contestants knew anything about what they were to be till the hour came at which they would be announced from the judges' boat.

Suddenly, as they neared the environs of Hampton and the glare of electric lights could be seen on the sky, Jimsy gave a cry and pointed down below. They were flying pretty low, and in a road beneath them they could see an automobile. Its headlights shone brightly but it had stopped. All at once a sharp shout for help winged upward.

"Hullo!" exclaimed Jimsy, "somebody's in trouble down there. Maybe we'd better descend. That is, if you girls aren't scared?"

"Um—well," began Jess, but Peggy interrupted her:

"Jess Bancroft, I'm ashamed of you. It's our duty to help out if we can."

"At least if it gets too hot we can always retreat," muttered Jimsy.

Under the covering of one of the lockers was a revolver. Under Peggy's directions Jimsy found it. The next moment they were descending rapidly. With hardly more noise than an alighting night bird, they dropped into the lane in which the auto was stalled. As they touched ground the sound of harsh voices caught their ears:

"Shell out now, if you don't want to be half-killed!"

"Yes, come on. Hand over your coin, or it'll be the worse for you," chimed in another ruffianly voice.

"Good gracious!" gasped Jess, "it's a hold up!"

But now another voice came through the darkness.

"I suppose you fellows know that you are breaking the law and in danger of imprisonment if you are caught?"

"Now, what is there that's familiar about that voice?" puzzled Peggy, racking her brains.

"Aw, don't preach sermons to us, boss," came one of the gruff voices, "we needs the money and we ain't particular how we gits it, see. Fork over now, or——"

The sentence was never completed. There was a sudden flash and a sharp report. The man in the automobile had defended himself apparently, for there came the sound of a heavy body falling, and then his voice:

"I hope I haven't hurt you badly; but you brought it on yourself, as your companion can witness."

The next instant, and just as Jimsy sprang forward from the clump of brush at the roadside which had hitherto concealed the aero party—there came a heavy rush of feet toward them. A dark form, running pantingly, appeared.

Jimsy, with a dexterous outward thrust of his foot, tripped the fleeing man, who came down heavily in the center of the road and started howling for mercy.

In the meantime, the occupant of the automobile had climbed down, and detaching one of the lamps, examined the wounded man lying in the road beyond Jimsy's capture. As the rays of his light swung to and fro they hovered for an instant on Peggy's white, strained face leaning forward above Jimsy's prisoner, upon whose neck the redoubtable young Bancroft was now sitting.

"Miss Prescott, by all that's wonderful!" came an amazed voice.

There was no mistaking that bold, straightforward voice now. It was James Bell, the mining magnate and their kind friend.

"Oh, Mr. Bell," cried Peggy, half hysterically, "we're so glad you've come!"



CHAPTER XX.

AN UNEXPECTED MEETING.

As Mr. Bell spoke, the fellow who had apparently been shot, leaped to his feet and was about to make off, but the Westerner's iron hand seized him by the scruff of the neck, and brought him up "all standing." Simultaneously, Jimsy's captive gave a wrench and a twist and would have escaped but for Peggy.

The girl seized a small nickled wrench out of the Golden Butterfly. In the dark it looked not unlike a pistol.

"You'd b-b-b-better stay w-w-w-where you are," said Peggy, in a voice which, though rather shaky, was still courageous.

The fellow took the hint, and just then Mr. Bell came up with his capture, who had merely been "playing possum." The two men were thoroughly cowed, and were trembling violently.