Knoll's eyes dropped again and he did not trust himself to speak.

"Well, you do not deny this statement?"

"No, I can't," said Knoll, still trying to control his voice. "You must have the watch yourself now, or else you wouldn't be so certain about it."

"Ah, you see, I thought you'd had experience with police courts before," said the commissioner amiably. "Of course I have the watch already. The man whom you sold it to this morning knew by three o'clock this afternoon where this watch came from. He brought it here at once and gave us your description. A very exact description. The man will be brought here to identify you to-morrow. We must send for him anyway, to return his money to him. He paid you fifty-two gulden for the watch. And how much money was in the purse that you took from the murdered man?"

"Three gulden eighty-five."

"That was a very small sum for which to commit a murder."

Knoll groaned and bit his lips until they bled.

Commissioner von Riedau raised the paper that covered the watch and continued: "You presumably recognised that the chain on which this watch hung was valueless, also that it could easily be recognised. Did you throw it away, or have you it still?"

"I threw it in the river."

"That will not make any difference. We do not need the chain, we have quite enough evidence without it. The purse, for instance: you thought, I suppose, that it was just a purse like a thousand others, but it is not. This purse is absolutely individual and easily recognised, because it is mended in one spot with yellow thread. The thread has become loosened and hangs down in a very noticeable manner. It was this yellow thread on the purse, which he happened to see by chance, that showed the dealer Goldstamm who it was that had entered his store."

Knoll stood quite silent, staring at the floor. Drops of perspiration stood out on his forehead, some of them rolling like tears down his cheek.

The commissioner rose from his seat and walked slowly to where the prisoner stood. He laid one hand on the man's shoulder and said in a voice that was quite gentle and kind again: "Johann Knoll, do not waste your time, or ours, in thinking up useless lies. You are almost convicted of this crime now. You have already acknowledged so much, that there is but little more for you to say. If you make an open confession, it will be greatly to your advantage."

Again the room was quiet while the others waited for what would happen. For a moment the tramp stood silent, with the commissioner's right hand resting on his shoulder. Then there was a sudden movement, a struggle and a shout, and the two policemen had overpowered the prisoner and held him firmly. Muller rose quickly and sprang to his chief's side. Riedau had not even changed colour, and he said calmly: "Oh, never mind, Muller; sit down again. The man had handcuffs on and he is quite quiet now. I think he has sense enough to see that he is only harming himself by his violence."

The commissioner returned to his desk and Muller went back to his chair by the window. The prisoner was quiet again, although his face wore a dark flush and the veins on throat and forehead were swollen thick. He trembled noticeably and the heavy drops besprinkled his brow.

"I—I have something to say, sir," he began, "but first I want to beg your pardon—"

"Oh, never mind that. I am not angry when a man is fighting for his life, even if he doesn't choose quite the right way," answered the commissioner calmly, playing with a lead pencil.

Knoll's expression was defiant now. He laughed harshly and began again: "What I'm tellin' you now is the truth whether you believe it or not. I didn't kill the man. I took the watch and purse from him. I thought he was drunk. If he was killed, I didn't do it."

"He was killed by a shot."

"A shot? Why, yes, I heard a shot, but I didn't think any more about it, I didn't think there was anythin' doing, I thought somebody was shootin' a cat, or else-"

"Oh, don't bother to invent things. It was a man who was shot at, the man whom you robbed. But go on, go on. I am anxious to hear what you will tell me."

Knoll's hands, clenched to fists and his eyes glowed in hate and defiance. Then he dropped them to the floor again and began to talk slowly in a monotonous tone that sounded as if he were repeating a lesson. His manner was rather unfortunate and did not tend to induce belief in the truth of his story. The gist of what he said was as follows:

He had reached Hietzing on Monday evening about 8 o'clock. He was thirsty, as usual, and had about two gulden in his possession, his wages for the last day's work. He turned into a tavern in Hietzing and ate and drank until his money was all gone, and he had not even enough left to pay for a night's lodging. But Knoll was not worried about that. He was accustomed to sleeping out of doors, and as this was a particularly fine evening, there was nothing in the prospect to alarm him. He set about finding a suitable place where he would not be disturbed by the guardians of the law. His search led him by chance into a newly opened street. This suited him exactly. The fences were easy to climb, and there were several little summer houses in sight which made much more agreeable lodgings than the ground under a bush. And above all, the street was so quiet and deserted that he knew it was just the place for him. He had never been in the street before, and did not know its name. He passed the four houses at the end of the street—he was on the left sidewalk—and then he came to two fenced-in building lots. These interested him. He was very agile, raised himself up on the fences easily and took stock of the situation. One of the lots did not appeal to him particularly, but the second one did. It bordered on a large garden, in the middle of which he could see a little house of some kind. It was after sunset but he could see things quite plainly yet for the air was clear and the moon was just rising. He saw also that in the vacant lot adjoining the garden, a lot which appeared to have been a garden itself once, there was a sort of shed. It looked very much damaged but appeared to offer shelter sufficient for a fine night.

The shed stood on a little raise of the ground near the high iron fence that protected the large garden. Knoll decided that the shed would make a good place to spend the night. He climbed the fence easily and walked across the lot. When he was just settling himself for his nap, he heard the clock on a near-by church strike nine. The various drinks he had had for supper put him in a mood that would not allow him to get to sleep at once. The bench in the old shed was decidedly rickety and very uncomfortable, and as he was tossing about to find a good position, a thought came into his mind which he acknowledged was not a commendable one. It occurred to him that if he pursued his investigations in the neighbourhood a little further, he might be able to pick up something that would be of advantage to him on his wanderings. His eyes and his thoughts were directed towards the handsome house which he could see beyond the trees of the old garden.

The moon was now well up in the sky and it shone brightly on the mansard roof of the fine old mansion. The windows of the long wing which stretched out towards the garden glistened in the moonbeams, and the light coloured wall of the house made a bright background for the dark mask of trees waving gently in the night breeze. Knoll's little shed was sufficiently raised on its hillock for him to have a good view of the garden. There was no door to the shed and he could see the neighbouring property clearly from where he lay on his bench. While he lay there watching, he saw a woman walking through the garden. He could see her only when she passed back of or between the lower shrubs and bushes. As far as he could see, she came from the main building and was walking towards a pretty little house which lay in the centre of the garden. Knoll had imagined this house to be the gardener's dwelling and as it lay quite dark he supposed the inmates were either asleep or out for the evening. It had been this house which he was intending to honour by a visit. But seeing the woman walking towards it, he decided it would not be safe to carry out his plan just yet awhile.

A few moments later he was certain that this last decision had been a wise one, for he saw a man come from the main building and walk along the path the woman had taken. "No, nothing doing there," thought Knoll, and concluded he had better go to sleep. He could not remember just how long he may have dozed but it seemed to him that during that time he had heard a shot. It did not interest him much. He supposed some one was shooting at a thieving cat or at some small night animal. He did not even remember whether he had been really sound asleep, before he was aroused by the breaking down of the bench on which he lay. The noise of it more than the shock of the short fall, awoke him and he sprang tip in alarm and listened intently to hear whether any one had been attracted by it. His first glance was towards the building behind the garden. There was no sound nor no light in the garden house but there was a light in the main building. While the tramp was wondering what hour it might be, the church clock answered him by ten loud strokes.

His head was already aching from the wine and he did not feel comfortable in the drafty old building. He came out from it, crept along to the spot where he had climbed the fence before, and after listening carefully and hearing nothing on either side, he climbed back to the road. The Street lay silent and empty, which was just what he was hoping for. He held carefully to the shadow thrown by the high board fence over which he had climbed until he came to its end. Then he remembered that he hadn't done anything wrong and stepped out boldly into the moonlight. The moon was well up now and the street was almost as light as day. Knoll was attracted by the queer shadows thrown by a big elder tree, waving its long branches in the wind. As he came nearer he saw that part of the shadow was no shadow at all but was the body of a man lying in the street near the bush. "I thought sure he was drunk" was the way Knoll described it. "I've been like that myself often until somebody came along and found me."

When he came to this spot in his story, he halted and drew a long breath. Commissioner von Riedau had begun to make some figures on the paper in front of him, then changed the lines until the head of a pretty woman in a fur hat took shape under his fingers.

"Well, go on," he said, looking with interest at his drawing and improving it with several quick strokes.

Johann Knoll continued:

"Then the devil came over me and I thought I better take this good opportunity—well—I did. The man was lying on his back and I saw a watch chain on his dark vest. I bent over him and took his watch and chain. Then I felt around in his pocket and found his purse. And then—well then I felt sorry for him lying out in the open road like that, and I thought I'd lift him up and put him somewhere where he could sleep it off more convenient. But I didn't see there was a little ditch there and I stumbled over it and dropped him. 'It's a good thing he's so drunk that even this don't wake him up,' I thought, and ran off. Then I thought I heard something moving and I was scared stiff, but there was nothing in the street at all. I thought I had better take to the fields though and I crossed through some corn and then out onto another street. Finally I walked into the city, stayed there till this morning, sold the watch, then went to Pressburg."

"So that was the way it was," said the commissioner, pushing his drawing away from him and motioning to the policemen at the door. "You may take this man away now," he added in a voice of cool indifference, without looking at the prisoner.

Knoll's head drooped and he walked out quietly between his two guards. The clock on the office wall struck eleven.

"Dear me! what a lot of time the man wasted," said the commissioner, putting the report of the proceedings, the watch and the purse in a drawer of his desk. "When anybody has been almost convicted of a crime, it's really quite unnecessary to invent such a long story."

A few minutes later, the room was empty and Muller, as the last of the group, walked slowly down the stairs. He was in such a brown study that he scarcely heard the commissioner's friendly "goodnight," nor did he notice that he was walking down the quiet street under a star-gilded sky. "Almost convicted—almost. Almost?" Muller's lips murmured while his head was full of a chaotic rush of thought, dim pictures that came and went, something that seemed to be on the point of bringing light into the darkness, then vanishing again. "Almost—but not quite. There is something here I must find out first. What is it? I must know—"



CHAPTER VII. THE FACE AT THE GATE

The second examination of the prisoner brought nothing new. Johann Knoll refused to speak at all, or else simply repeated what he had said before. This second examination took place early the next morning, but Muller was not present. He was taking a walk in Hietzing.

When they took Johann Knoll in the police wagon to the City Prison, Muller was just sauntering slowly through the street where the murder had been committed. And as the door of the cell shut clangingly behind the man whose face was distorted in impotent rage and despair, Joseph Muller was standing in deep thought before the broken willow twig, which now hung brown and dry across the planks of the fence. He looked at it for a long time. That is, he seemed to be looking at it, but in reality his eyes were looking out and beyond the willow twig, out into the unknown, where the unknown murderer was still at large. Leopold Winkler's body had already been committed to the earth. How long will it be before his death is avenged? Or perhaps how long may it even be before it is discovered from what motive this murder was committed. Was it a murder for robbery, or a murder for personal revenge perhaps? Were the two crimes committed here by one and the same person, or were there two people concerned? And if two, did they work as accomplices? Or is it possible that Knoll's story was true? Did he really only rob the body, not realising that it was a dead man and not merely an intoxicated sleeper as he had supposed? These and many more thoughts rushed tumultuously through Muller's brain until he sighed despairingly under the pressure. Then he smiled in amusement at the wish that had crossed his brain, the wish that this case might seem as simple to him as it apparently did to the commissioner. It would certainly have saved him a lot of work and trouble if he could believe the obvious as most people did. What was this devil that rode him and spurred him on to delve into the hidden facts concerning matters that seemed so simple on the surface? The devil that spurred him on to understand that there always was some hidden side to every case? Then the sigh and the smile passed, and Muller raised his head in one of the rare moments of pride in his own gifts that this shy unassuming little man ever allowed himself. This was the work that he was intended by Providence to do or he wouldn't have been fitted for it, and it was work for the common good, for the public safety. Thinking back over the troubles of his early youth, Muller's heart rejoiced and he was glad in his own genius. Then the moment of unwonted elation passed and he bent his mind again to the problem before him.

He sauntered slowly through the quiet street in the direction of the four houses. To reach them he passed the fence that enclosed this end of the Thorne property. Muller had already known, for the last twenty-four hours at least, that the owner of the fine old estate was an artist by the name of Herbert Thorne. His own landlady had informed him of this. He himself was new to the neighbourhood, having moved out there recently, and he had verified her statements by the city directory. As he was now passing the Thorne property, in his slow, sauntering walk, he had just come within a dozen paces of the little wooden gate in the fence when this gate opened. Muller's naturally soft tread was made still more noiseless by the fact that he wore wide soft shoes. Years before he had acquired a bad case of chilblains, in fact had been in imminent danger of having his feet frozen by standing for five hours in the snow in front of a house, to intercept several aristocratic gentlemen who sooner or later would be obliged to leave that house. The police had long suspected the existence of this high-class gambling den; but it was not until they had put Muller in charge of the case, that there were any results attained. The arrests were made at the risk of permanent injury to the celebrated detective. Since then, Muller's step was more noiseless than usual, and now the woman who opened the gate and peered out cautiously did not hear his approach nor did she see him standing in the shadow of the fence. She looked towards the other end of the street, then turned and spoke to somebody behind her. "There's nobody coming from that direction," he said. Then she turned her head the other way and saw Muller. She looked at him for a moment and slammed the gate shut, disappearing behind it. Muller heard the lock click and heard the beat of running feet hastening rapidly over the gravel path through the garden.

The detective stood immediately in front of the gate, shaking his head. "What was the matter with the woman? What was it that she wanted to see or do in the street? Why should she run away when she saw me?" These were his thoughts. But he didn't waste time in merely thinking. Muller never did. Action followed thought with him very quickly. He saw a knot-hole in the fence just beside the gate and he applied his eyes to this knot-hole. And through the knot-hole he saw something that interested and surprised him.

The woman whose face had appeared so suddenly at the gate, and disappeared still more suddenly, was the same woman whom he had seen bidding farewell to Mr. Thorne and his wife on the Tuesday morning previous, the woman whom he took to be the housekeeper. The old butler stood beside her. It was undoubtedly the same man, although he had worn a livery then and was now dressed in a comfortable old house coat. He stood beside the woman, shaking his head and asking her just the questions that Muller was asking himself at the moment.

"Why, what is the matter with you, Mrs. Bernaner? You're so nervous since yesterday. Are you ill? Everything seems to frighten you? Why did you run away from that gate so suddenly? I thought you wanted me to show you the place?"

Mrs. Bernauer raised her head and Muller saw that her face looked pale and haggard and that her eyes shone with an uneasy feverish light. She did not answer the old man's questions, but made a gesture of farewell and then turned and walked slowly towards the house. She realised, apparently, and feared, perhaps, that the man who was passing the gate might have, noticed her sudden change of demeanour and that he was listening to what she might say. She did not think of the knot-hole in the board fence, or she might have been more careful in hiding her distraught face from possible observers.

Muller stood watching through this knot-hole for some little time. He took a careful observation of the garden, and from his point of vantage he could easily see the little house which was apparently the dwelling of the gardener, as well as the mansard roof of the main building. There was considerable distance between the two houses. The detective decided that it might interest him to know something more about this garden, this house and the people who lived there. And when Muller made such a decision it was usually not very long before he carried it out.

The other street, upon which the main front of the mansard house opened, contained a few isolated dwellings surrounded by gardens and a number of newly built apartment houses. On the ground floor of these latter houses were a number of stores and immediately opposite the Thorne mansion was a little cafe. This suited Muller exactly, for he had been there before and he remembered that from one of the windows there was an excellent view of the gate and the front entrance of the mansion opposite. It was a very modest little cafe, but there was a fairly good wine to be had there and the detective made it an excuse to sit down by the window, as if enjoying his bottle while admiring the changing colours of the foliage in the gardens opposite.

Another rather good chance, he discovered, was the fact that the landlord belonged to the talkative sort, and believed that the refreshments he had to sell were rendered doubly agreeable when spiced by conversation. In this case the good man was not mistaken. It was scarcely ten o'clock in the forenoon and there were very few people in the cafe. The landlord was quite at leisure to devote himself to this stranger in the window seat, whom he did not remember to have seen before, and who was therefore doubly interesting to him. Several subjects of conversation usual in such cases, such as politics and the weather, seemed to arouse no particular enthusiasm in his patron's manner. Finally the portly landlord decided that he would touch upon the theme which was still absorbing all Hietzing.

"Oh, by the way, sir, do you know that you are in the immediate vicinity of the place where the murder of Monday evening was committed? People are still talking about it around here. And I see by the papers that the murderer was arrested in Pressburg yesterday and brought to Vienna last night."

"Indeed, is that so? I haven't seen a paper to-day," replied Muller, awakening from his apparent indifference.

The landlord was flattered by the success of the new subject, and stood ready to unloose the floodgates of his eloquence. His customer sat up and asked the question for which the landlord was waiting.

"So it was around here that the man was shot?"

"Yes. His name was Leopold Winkler, that was in the papers to-day too. You see that pretty house opposite? Well, right behind this house is the garden that belongs to it and back of that, an old garden which has been neglected for some time. It was at the end of this garden where it touches the other street, that they found the man under a big elder-tree, early Tuesday morning, day before yesterday."

"Oh, indeed!" said. Muller, greatly interested, as if this was the first he had heard of it. The landlord took a deep breath and was about to begin again when his customer, who decided to keep the talkative man to a certain phase of the subject, now took command of the conversation himself.

"I should think that the people opposite, who live so near the place where the murder was committed, wouldn't be very much pleased," he said. "I shouldn't care to look out on such a spot every time I went to my window."

"There aren't any windows there," exclaimed the landlord, "for there aren't any houses there. There's only the old garden, and then the large garden and the park belonging to Mr. Thorne's house, that fine old house you see just opposite here. It's a good thing that Mr. Thorne and his wife went away before the murder became known. The lady hasn't been well for some weeks, she's very nervous and frail, and it probably would have frightened her to think that such things were happening right close to her home."

"The lady is sick? What's the matter with her?"

"Goodness knows, nerves, heart trouble, something like that. The things these fine ladies are always having. But she wasn't always that way, not until about a year ago. She was fresh and blooming and very pretty to look at before that."

"She is a young lady then?"

"Yes, indeed, sir; she's very young still and very pretty. It makes you feel sorry to see her so miserable, and you feel sorry for her husband. Now there's a young couple with everything in the world to make them happy and so fond of each other, and the poor little lady has to be so sick."

"They are very happy, you say?" asked Muller carelessly. He had no particular set purpose in following up this inquiry, none but his usual understanding of the fact that a man in his business can never amass too much knowledge, and that it will sometimes happen that a chance bit of information comes in very handy.

The landlord was pleased at the encouragement and continued: "Indeed they are very happy. They've only been married two years. The lady comes from a distance, from Graz. Her father is an army officer I believe, and I don't think she was over-rich. But she's a very sweet-looking lady and her rich husband is very fond of her, any one can see that."

"You said just now that they had gone away, where have they gone to?"

"They've gone to Italy, sir. Mrs. Thorne was one of the few people who do not know Venice. Franz, that's the butler, sir, told me yesterday evening that he had received a telegram saying that the lady and gentleman had arrived safely and were very comfortably fixed in the Hotel Danieli. You know Danieli's?"

"Yes, I do. I also was one of the few people who did not know Venice, that is I was until two years ago. Then, however, I had the pleasure of riding over the Bridge of Mestre," answered Muller. He did not add that he was not alone at the time, but had ridden across the long bridge in company with a pale haggard-faced man who did not dare to look to the right or to the left because of the revolver which he knew was held in the detective's hand under his loose overcoat. Muller's visit to Venice, like most of his journeyings, had been one of business. This time to capture and bring home a notorious and long sought embezzler. He did not volunteer any of this information, however, but merely asked in a politely interested manner whether the landlord himself had been to Venice.

"Yes, indeed," replied the latter proudly. "I was head waiter at Baner's for two years."

"Then you must make me some Italian dishes soon," said Muller. Further conversation was interrupted by the entrance of Franz, the old butler of the house opposite.

"Excuse me, sir; I must get him his glass of wine," said the landlord, hurrying away to the bar. He returned in a moment with a small bottle and a glass and set it down on Muller's table.

"You don't mind, sir, if he sits down here?" he asked. "He usually sits here at this table because then he can see if he is needed over at the house."

"Oh, please let him come here. He has prior rights to this table undoubtedly," said the stranger politely. The old butler sat down with an embarrassed murmur, as the voluble landlord explained that the stranger had no objection. Then the boniface hurried off to attend to some newly entered customers and the detective, greatly pleased at the prospect, found himself alone with the old servant.

"You come here frequently?" he began, to open the conversation.

"Yes, sir, since my master and myself have settled down here—we travelled most of the time until several years ago—I find this place very convenient. It's a cosy little room, the wine is good and not expensive, I'm near home and yet I can see some new faces occasionally."

"I hope the faces that you see about you at home are not so unpleasant that you are glad to get away from them?" asked Muller with a smile.

The old man gave a start of alarm. "Oh, dear, no, sir," he exclaimed eagerly; "that wasn't what I meant. Indeed I'm fond of everybody in the house from our dear lady down to the poor little dog."

Here Muller gained another little bit of knowledge, the fact that the lady of the house was the favourite of her servants, or that she seemed to them even more an object of adoration than the master.

"Then you evidently have a very good place, since you seem so fond of every one."

"Indeed I have a good place, sir."

"You've had this place a long time?"

"More than twenty years. My master was only eleven years old when I took service with the family."

"Ah, indeed! then you must be a person of importance in the house if you have been there so long?"

"Well more or less I might say I am," the old man smiled and looked flattered, then added: "But the housekeeper, Mrs. Bernaner, is even more important than I am, to tell you the truth. She was nurse to our present young master, and she's been in the house ever since. When his parents died, it's some years ago now, she took entire charge of the housekeeping. She was a fine active woman then, and now the young master and mistress couldn't get along without her. They treat her as if she was one of the family."

"And she is ill also? I say also," explained Muller, "because the landlord has just been telling me that your mistress is ill."

"Yes, indeed, more's the pity! our poor dear young lady has been miserable for nearly a year now. It's a shame to see such a sweet angel as she is suffer like that and the master's quite heart-broken over it. But there's nothing the matter with Mrs. Bernaner. How did you come to think that she was sick?"

Muller did not intend to explain that the change in the housekeeper's appearance, a change which had come about between Tuesday morning and Thursday morning, might easily have made any one think that she was ill. He gave as excuse for his question the old man's own words: "Why, I thought that she might be ill also because you said yourself that the housekeeper—what did you say her name was?"

"Bernauer, Mrs. Adele Bernauer. She was a widow when she came to take care of the master. Her husband was a sergeant of artillery."

"Well, I mean," continued Muller, "you said yourself that when the gentleman's parents died, Mrs. Bernauer was a fine active woman, therefore I supposed she was no longer so."

Franz thought the matter over for a while. "I don't know just why I put it that way. Indeed she's still as active as ever and always fresh and well. It's true that for the last two or three days she's been very nervous and since yesterday it is as if she was a changed woman. She must be ill, I don't know how to explain it otherwise."

"What seems to be the matter with her?" asked Muller and then to explain his interest in the housekeeper's health, he fabricated a story: "I studied medicine at one time and although I didn't finish my course or get a diploma, I've always had a great interest in such things, and every now and then I'll take a case, particularly nervous diseases. That was my specialty." Muller took up his glass and turned away from the window, for he felt a slow flush rising to his cheeks. It was another of Muller's peculiarities that he always felt an inward embarrassment at the lies he was obliged to tell in his profession.

The butler did not seem to have noticed it however, and appeared eager to tell of what concerned him in the housekeeper's appearance and demeanour. "Why, yesterday at dinner time was the first that we began to notice anything wrong with Mrs. Bernauer. The rest of us, that is, Lizzie the upstairs girl, the cook and myself. She began to eat her dinner with a good appetite, then suddenly, when we got as far as the pudding, she let her fork fall and turned deathly white. She got up without saying a word and left the room. Lizzie ran after her to ask if anything was the matter, but she said no, it was nothing of importance. After dinner, she went right out, saying she was doing some errands. She brought in a lot of newspapers, which was quite unusual, for she sometimes does not look at a newspaper once a week even. I wouldn't have noticed it but Lizzie's the kind that sees and hears everything and she told us about it." Franz stopped to take a drink, and Muller said indifferently, "I suppose Mrs. Bernauer was interested in the murder case. The whole neighbourhood seems to be aroused about it."

"No, I don't think that was it," answered the old servant, "because then she would have sent for a paper this morning too."

"And she didn't do that?"

"No, unless she might have gone out for it herself. There's a news stand right next door here. But I don't think she did because I would have seen the paper around the house then."

"And is that all that's the matter with her?" asked Muller in a tone of disappointment. "Why, I thought you'd have something really interesting to tell me."

"Oh, no, that isn't all, sir," exclaimed the old man eagerly.

Muller leaned forward, really interested now, while Franz continued: "She was uneasy all the afternoon yesterday. She walked up and down stairs and through the halls—I remember Lizzie making some joke about it—and then in the evening to our surprise she suddenly began a great rummaging in the first story."

"Is that where she lives?"

"Oh, no; her room is in the wing out towards the garden. The rooms on the first floor all belong to the master and mistress. This morning we found out that Mrs. Bernauer's cleaning up of the evening before had been done because she remembered that the master wanted to take some papers with him but couldn't find them and had asked her to look for them and send them right on."

"Well, I shouldn't call that a sign of any particular nervousness, but rather an evidence of Mrs. Bernaner's devotion to her duty."

"Oh, yes, sir—but it certainly is queer that she should go into the garden at four o'clock this morning and appear to be looking for something along the paths and under the bushes. Even if a few of the papers blew out of the window, or blew away from the summer house, where the master writes sometimes, they couldn't have scattered all over the garden like that."

Muller didn't follow up this subject any longer. There might come a time when he would be interested in finding out the reason for the housekeeper's search in the garden, but just at present he wanted something else. He remembered some remark of the old man's about the "poor little dog," and on this he built his plan.

"Oh, well," he said carelessly, "almost everybody is nervous and impatient now-a-days. I suppose Mrs. Bernauer felt uneasy because she couldn't find the paper right away. There's nothing particularly interesting or noticeable about that. Anyway, I've been occupying myself much more these last years with sick animals rather than with sick people. I've had some very successful cures there."

"No, really, have you? Then you could do us a great favour," exclaimed Franz in apparent eagerness. Muller's heart rejoiced. He had apparently hit it right this time. He knew that in a house like that "a poor dog" could only mean a "sick dog." But his voice was quite calm as he asked: "How can I do you a favour?"

"Why, you see, sir, we've got a little terrier," explained the old man, who had quite forgotten the fact that he had mentioned the dog before. "And there's been something the matter with the poor little chap for several days. He won't eat or drink, he bites at the grass and rolls around on his stomach and cries—it's a pity to see him. If you're fond of animals and know how to take care of them, you may be able to help us there."

"You want me to look at the little dog? Why, yes, I suppose I can."

"We'll appreciate it," said the old man with an embarrassed smile. But Muller shook his head and continued: "No, never mind the payment, I wouldn't take any money for it. But I'll tell you what you can do for me. I'm very fond of flowers. If you think you can take the responsibility of letting me walk around in the garden for a little while, and pick a rose or two, I will be greatly pleased."

"Why, of course you may," said Franz. "Take any of the roses you see there that please you. They're nearly over for the season now and it's better they should be picked rather than left to fade on the bush. We don't use so many flowers in the house now when the family are not there."

"All right, then, it's a bargain," laughed Muller, signalling to the landlord. "Are you, going already?" asked the old servant.

"Yes, I must be going if I am to spend any time with the little dog."

"I suppose I ought to be at home myself," said Franz. "Something's the matter with the electric wiring in our place. The bell in the master's room keeps ringing. I wrote to Siemens & Halske to send us a man out to fix it. He's likely to come any minute now." The two men rose, paid their checks, and went out together. Outside the cafe Muller hesitated a moment. "You go on ahead," he said to Franz. "I want to go in here and get a cigar."

While buying his cigar and lighting it, he asked for several newspapers, choosing those which his quick eye had told him were no longer among the piles on the counter. "I'm very sorry, sir," said the clerk; "we have only a few of those papers, just two or three more than we need for our regular customers, and this morning they are all sold. The housekeeper from the Thorne mansion took the very last ones."

This was exactly what Muller wanted to know. He left the store and caught up with the old butler as the latter was opening the handsome iron gate that led from the Thorne property out onto the street.

"Well, where's our little patient?" asked the detective as he walked through the courtyard with Franz.

"You'll see him in a minute," answered the old servant. He led the way through a light roomy corridor furnished with handsome old pieces in empire style, and opened a door at its further end.

"This is my room."

It was a large light room with two windows opening on the garden. Muller was not at all pleased that the journey through the hall had been such a short one. However he was in the house, that was something, and he could afford to trust to chance for the rest. Meanwhile he would look at the dog. The little terrier lay in a corner by the stove and it did not take Muller more than two or three minutes to discover that there was nothing the matter with the small patient but a simple case of over-eating. But he put on a very wise expression as he handled the little dog and looking up, asked if he could get some chamomile tea.

"I'll go for it, I think there's some in the house. Do you want it made fresh?" said Franz.

"Yes, that will be better, about a cupful will do," was Muller's answer. He knew that this harmless remedy would be likely to do the dog good and at the present moment he wanted to be left alone in the room. As soon as Franz had gone, the detective hastened to the window, placing himself behind the curtain so that he could not be seen from outside. He himself could see first a wide courtyard lying between the two wings of the house, then beyond it the garden, an immense square plot of ground beautifully cultivated. The left wing of the house was about six windows longer than the other, and from the first story of it it would be quite easy to look out over the vacant lot where the old shed stood which had served as a night's lodging for Johann Knoll.

There was not the slightest doubt in Muller's mind that this part of the tramp's story was true, for by a natural process of elimination he knew there was nothing to be gained by inventing any such tale. Besides which the detective himself had been to look at the shed. His well-known pedantic thoroughness would not permit him to take any one's word for anything that he might find out for himself, In his investigations on Tuesday morning he had already seen the half-ruined shed, now he knew that it contained a broken bench.

Thus far, therefore, Knoll's story was proved to be true-but there was something that didn't quite hitch in another way. The tramp had said that he had seen first a woman and then a man come from the main house and go in the direction of the smaller house which he took to be the gardener's dwelling. This Muller discovered now was quite impossible. A tall hedge, fully seven or eight feet high and very thick, stretched from the courtyard far down into the garden past the gardener's little house. There was a broad path on the right and the left of this green wall. From his position in the shed, Knoll could have seen people passing only when they were on the right side of the hedge. But to reach the gardener's house from the main dwelling, the shortest way would be on the left side of the hedge. This much Muller saw, then he heard the butler's steps along the hall and he went back to the corner where the dog lay.

Franz was not alone. There was some one else with him, the housekeeper, Mrs. Bernauer. Just as they opened the door, Muller heard her say: "If the gentleman is a veterinary, then we'd better ask him about the parrot—"

The sentence was never finished. Muller never found out what was the matter with the parrot, for as he looked up with a polite smile of interest, he looked into a pale face, into a pair of eyes that opened wide in terror, and heard trembling lips frame the words: "There he is again!"

A moment later Mrs. Bernauer would have been glad to have recalled her exclamation, but it was too late.

Muller bowed before her and asked: "'There he is again,' you said; have you ever seen me before?"

The woman looked at him as if hypnotised and answered almost in a whisper: "I saw you Tuesday morning for the first time, Tuesday morning when the family were going away. Then I saw you pass through our street twice again that same day. This morning you went past the garden gate and now I find you here. What-what is it you want of us?"

"I will tell you what I want, Mrs. Bernauer, but first I want to speak to you alone. Mr. Franz doesn't mind leaving us for a while, does he?"

"But why?" said the old man hesitatingly. He didn't understand at all what was going on and he would much rather have remained.

"Because I came here for the special purpose of speaking to Mrs. Bernauer," replied Muller calmly.

"Then you didn't come on account of the dog?"

"No, I didn't come on account of the dog."

"Then you—you lied to me?"

"Partly."

"And you're no veterinary?"

"No—I can help your dog, but I am not a veterinary and never have been."

"What are you then?"

"I will tell Mrs. Bernauer who and what I am when you are outside—outside in the courtyard there. You can walk about in the garden if you want to, or else go and get some simple purgative for this dog. That is all he needs; he has been over-fed."

Franz was quite bewildered. These new developments promised to be interesting and he was torn between his desire to know more, and his doubts as to the propriety of leaving the housekeeper with this queer stranger. He hesitated until the woman herself motioned to him to go. He went out into the hall, then into the courtyard, watched by the two in the room who stood silently in the window until they saw the butler pass down into the garden. Then they looked at each other.

"You belong to the police?" asked Adele Bernauer finally with a deep sigh.

"That was a good guess," replied Muller with an ironic smile, adding: "All who have any reason to fear us are very quick in recognising us."

"What do you mean by that?" she exclaimed with a start. "What are you thinking of?"

"I am thinking about the same thing that you are thinking of—that I have proved you are thinking of—the same thing that drove you out into the street yesterday and this morning to buy the papers. These papers print news which is interesting many people just now, and some people a great deals. I am thinking of the same thing that was evidently in your thoughts as you peered out of the garden gate this morning, although you would not come out into the street. I know that you do not read even one newspaper regularly. I know also that yesterday and today you bought a great many papers, apparently to get every possible detail about a certain subject. Do you deny this?"

She did not deny it, she did not answer at all. She sank down on a chair, her wide staring eyes looking straight ahead of her, and trembling so that the old chair cracked underneath her weight. But this condition did not last long. The woman had herself well under control. Muller's coming, or something else, perhaps, may have overwhelmed her for a moment, but she soon regained her usual self-possession.

"Still you have not told me what you want here," she began coldly, and as he did not answer she continued: "I have a feeling that you are watching us. I had this feeling when I saw you the first time and noticed then—pardon my frankness—that you stared at us sharply while we were saying goodbye to our master and mistress. Then I saw you pass twice again through the street and look up at our windows. This morning I find you at our garden gate and now—you will pardon me if I tell the exact truth—now you have wormed yourself in here under false pretenses because you have no right whatever to force an entrance into this house. And I ask you again, what do you want here?"

Muller was embarrassed. That did not happen very often. Also it did not happen very often that he was in the wrong as he was now. The woman was absolutely right. He had wormed himself into the house under false pretenses to follow up the new clue which almost unconsciously as yet was leading him on with a stronger and stronger attraction. He could not have explained it and he certainly was not ready to say anything about it at police headquarters, even at the risk of being obliged to continue to enter this mysterious house under false pretenses and to be told that he was doing so. Of course this sort of thing was necessary in his business, it was the only way in which he could follow up the criminals.

But there was something in this woman's words that cut into a sensitive spot and drove the blood to his cheeks. There was something in the bearing and manner of this one-time nurse that impressed him, although he was not a man to be lightly impressed. He had a feeling that he had made a fool of himself and it bothered him. For a moment he did not know what he should say to this woman who stood before him with so much quiet energy in her bearing. But the something in his brain, the something that made him what he was, whispered to him that he had done right, and that he must follow up the trail he had found. That gave him back his usual calm.

He took up his hat, and standing before the pale-faced woman, looking her firmly in the eyes, he said: "It is true that I have no right as yet to force my way into your house, therefore I have been obliged to enter it as best I could. I have done this often in my work, but I do it for the safety of society. And those who reproach me for doing it are generally those whom I have been obliged to persecute in the name of the law. Mrs. Bernauer, I will confess that there are moments in which I feel ashamed that I have chosen this profession that compels me to hunt down human beings. But I do not believe that this is one of those moments. You have read this morning's papers; you must know, therefore, that a man has been arrested and accused of the murder which interests you so much; you must be able to realise the terror and anxiety which are now filling this man's heart. For to-day's papers—I have read them myself—expressed the public sentiment that the police may succeed in convicting this man of the crime, that the death may be avenged and justice have her due. Several of these papers, the papers I know you have bought and presumably read, do not doubt that Johann Knoll is the murderer of Leopold Winkler.

"Now there are at least two people who do not believe that Knoll is the murderer. I am one of them, and you, Mrs. Bernauer, you are the other. I am going now and when I come again, as I doubtless will come again, I will come with full right to enter this house. I acknowledge frankly that I have no justification in causing your arrest as yet, but you are quite clever enough to know that if I had the faintest justification I would not leave here alone. And one thing more I have to say. You may not know that I have had the most extraordinary luck in my profession, that in more than a hundred cases there have been but two where the criminal I was hunting escaped me. And now, Mrs. Bernauer, I will bid you good day."

Muller stepped towards the window and motioned to Franz, who was walking up and down outside. The old man ran to the door and met the detective in the hall.

"You'd better go in and look after Mrs. Bernauer," said the latter, "I can find my way out alone."

Franz looked after him, shaking his head in bewilderment and then entered his own room. "Merciful God!" he exclaimed, bending down in terror over the housekeeper, who lay on the floor. In his shock and bewilderment he imagined that she too had been murdered, until he realised that it was only a swoon from which she recovered in a moment. He helped her regain her feet and she looked about as if still dazed, stammering: "Has he gone?"

"The strange man? ... Yes, he went some time ago. But what happened to you? Did he give you something to make you faint? Do you think he was a thief?"

Mrs. Bernauer shook her head and murmured: "Oh, no, quite the contrary." A remark which did not enlighten Franz particularly as to the status of the man who had just left them. There was a note of fear in the housekeepers's voice and she added hastily: "Does any one besides ourselves know that he was here?"

"No, Lizzie and the cook are in the kitchen talking about the murder."

Mrs. Bernauer shivered again and went slowly out of the room and up the stairs.

If Franz believed that the stranger had left the house by the front entrance he was very much mistaken. When Muller found himself alone in the corridor he turned quickly and hurried out into the garden. None of the servants had seen him. Lizzie and the cook were engaged in an earnest conversation in the kitchen and Franz was fully occupied with Mrs. Bernauer. The gardener was away and his wife busy at her wash tubs. No one was aware, therefore, that Muller spent about ten minutes wandering about the garden, and ten minutes were quite sufficient for him to become so well acquainted with the place that he could have drawn a map of it. He left the garden through the rear gate, the latch of which he was obliged to leave open. The gardener's wife found it that way several hours later and was rather surprised thereat. Muller walked down the street rapidly and caught a passing tramway. His mood was not of the best, for he could not make up his mind whether or no this morning had been a lost one. His mind sorted and rearranged all that he knew or could imagine concerning Mrs. Bernaner. But there was hardly enough of these facts to reassure him that he was not on a false trail, that he had not allowed himself to waste precious hours all because he had seen a woman's haggard face appear for a moment at the little gate in the quiet street.



CHAPTER VIII. JOHANN KNOLL REMEMBERS SOMETHING ELSE

Muller's goal was the prison where Johann Knoll was awaiting his fate. The detective had permission to see the man as often as he wished to. Knoll had been proven a thief, but the accusation of murder against him had not been strengthened by anything but the most superficial circumstantial evidence, therefore it was necessary that Muller should talk with him in the hope of discovering something more definite.

Knoll lay asleep on his cot as the detective and the warder entered the cell. Muller motioned the attendant to leave him alone with the prisoner and he stood beside the cot looking down at the man. The face on the hard pillow was not a very pleasant one to look at. The skin was roughened and swollen and had that brown-purple tinge which comes from being constantly in the open air, and from habitual drinking. The weather-beaten look may be seen often in the faces of men whose honest work keeps them out of doors; but this man had not earned his colouring honestly, for he was one of the sort who worked only from time to time when it was absolutely necessary and there was no other way of getting a penny. His hands proved this, for although soiled and grimy they had soft, slender fingers which showed no signs of a life of toil. But even a man who has spent forty years in useless idling need not be all bad. There must have been some good left in this man or he could not have lain there so quietly, breathing easily, wrapped in a slumber as undisturbed as that of a child. It did not seem possible that any man could lie there like that with the guilt of murder on his conscience, or even with the knowledge in his soul that he had plundered a corpse.

Muller had never believed the first to be the case, but he had thought it possible that Knoll knew perfectly well that it was a lifeless body he was robbing. He had believed it at least until the moment when he stood looking down at the sleeping tramp. Now, with the deep knowledge of the human heart which was his by instinct and which his profession had increased a thousand-fold, Muller knew that this man before him had no heavy crime upon his conscience—that it was really as he had said—that he had taken the watch and purse from one whom he believed to be intoxicated only. Of course it was not a very commendable deed for which the tramp was now in prison, but it was slight in comparison to the crimes of which he was suspected.

Muller bent lower over the unconscious form and was surprised to see a gentle smile spread over the face before him. It brightened and changed the coarse rough face and gave it for a moment a look of almost child-like innocence. Somewhere within the coarsened soul there must be a spot of brightness from which such a smile could come.

But the face grew ugly again as Knoll opened his eyes and looked up. He shook off the clouds of slumber as he felt Muller's hand on his shoulder and raised himself to a sitting position, grumbling: "Can't I have any rest? Are they going to question me again? I'm getting tired of this. I've said everything I know anyhow."

"Perhaps not everything. Perhaps you will answer a few of my questions when I tell you that I believe the story you told us yesterday, and that I want to be your friend and help you."

Knoll's little eyes glanced up without embarrassment at the man who spoke to him. They were sharp eyes and had a certain spark of intelligence in them. Muller had noticed that yesterday, and he saw it again now. But he saw also the gleam of distrust in these eyes, a distrust which found expression in Knoll's next words. "You think you can catch me with your good words, but you're makin' a mistake. I've got nothin' new to say. And you needn't think that you can blind me, I know you're one of the police, and I'm not going to say anything at all."

"Just as you like. I was trying to help you, I believe I really could help you. I have just come from Hietzing—but of course if you don't want to talk to me—" Muller shrugged his shoulders and turned toward the door.

But before he reached it Knoll stood at his side. "You really mean to help me?" he gasped.

"I do," said the detective calmly.

"Then swear, on your mother's soul—or is your mother still alive?"

"No, she has been dead some time."

"Well, then, will you swear it?"

"Would you believe an oath like that?"

"Why shouldn't I?"

"With the life you've been leading?"

"My life's no worse than a lot of others. Stealing those things on Monday was the worst thing I've done yet. Will you swear?"

"Is it something so very important you have to tell me?"

"No, I ain't got nothin' at all new to tell you. But I'd just like to know—in this black hole I've got into—I'd just like to know that there's one human being who means well with me—I'd like to know that there's one man in the world who don't think I'm quite good-for-nothin'."

The tramp covered his face with his hands and gave a heart-rending sob. Deep pity moved the detective's breast. He led Knoll back to his cot, and put both hands on his shoulders, saying gravely: "I believe that this theft was the worst thing you have done. By my mother's salvation, Knoll, I believe your words and I will try to help you."

Knoll raised his head, looking up at Muller with a glance of unspeakable gratitude. With trembling lips he kissed the hand which a moment before had pressed kindly on his shoulder, clinging fast to it as if he could not bear to let it go. Muller was almost embarrassed. "Oh, come now, Knoll, don't be foolish. Pull yourself together and answer my questions carefully, for I am asking you these questions more for your own sake than for anything else."

The tramp nodded and wiped the tears from his face. He looked almost happy again, and there was a softness in his eyes that showed there was something in the man which might be saved and which was worth saving.

Muller sat beside him on the cot and began: "There was one mistake in your story yesterday. I want you to think it over carefully. You said that you saw first a woman and then a man going through the neighbouring garden. I believe that one or both of these people is the criminal for whom we are looking. Therefore, I want you to try and remember everything that you can connect with them, every slightest detail. Anything that you can tell us may be of the greatest importance. Therefore, think very carefully."

Knoll sat still a few moments, evidently trying hard to put his hazy recollections into useful form and shape. But it was also evident that orderly thinking was an unusual work for him, and he found it almost too difficult. "I guess you 'better ask me questions, maybe that'll go," he said after a pause.

Then Muller began to question. With his usual thoroughness he began at the very beginning: "When was it that you climbed the fence to get into the shed?"

"It just struck nine o'clock when I put my foot on the lowest bar."

"Are you sure of that?"

"Quite sure. I counted every stroke. You see, I wanted to know how long the night was going to be, seein' I'd have to sleep in that shed. I was in the garden just exactly an hour. I came out of the shed as it struck ten and it wasn't but a few minutes before I was in the street again."

"And when was it that you saw the woman in the garden next door?"

"H'm, I don't just know when that was. I'd been in on the bench quite a while."

"And the man? When did you see the man?"

"He came past a few minutes after the woman had gone towards the little house in the garden."

"Ah! there you see, that's where you made your mistake. It is more than likely that these two did not go to the little house, but that they went somewhere else. Did they walk slowly and quietly?"

"Not a bit of it. They ran almost... Went past as quick as a bat in the night."

"Then they both appeared to be in a hurry?"

"Yes indeed they did."

"Ah, ha, you see! Now when any one's in a hurry he doesn't go the longest way round, as a rule. And it would have been the longest way round for these two people to go from the big house to the gardener's cottage—for the little house you saw was the gardener's cottage. There is tall thick hedge that starts from the main building and goes right down through the garden, quite a distance past the gardener's cottage. The vegetable garden is on the left side of this hedge and in the middle of the vegetable garden is the gardener's cottage. But you could have seen the man and the woman only because they passed down the right side of the hedge, and this would have given them a detour of fifty paces or more to reach the gardener's house. Nov do you think that two people who were very much in a hurry would have gone down the right side of the hedge, to reach a place which they could have gotten to much quicker on the left side?"

"No, that would have been a fool thing to do."

"And you are quite sure that these people were in a hurry?"

"That's dead sure. I scarcely saw them before they'd gone again."

"And you didn't see them come back?"

"No, at least I didn't pay any further attention to them. When I thought it wouldn't be any good to look about in there I turned around and dozed off."

"And it was during this dozing that you thought you heard the shot?"

"Yes, sir, that's right."

"And you didn't notice anything else? You didn't hear anything else."

"No, nothin' at all, there was so much noise anyway. There was a high wind that night and the trees were rattling and creaking."

"And you didn't see anything else, anything that attracted your attention?"

"No, nothing—" Knoll did not finish his sentence, but began another instead. He had suddenly remembered something which had seemed to him of no importance before. "There was a light that went out suddenly."

"Where?"

"In the side of the house that I could see from my place. There was a lamp in the last window of the second story, a lamp with a red shade. That lamp went out all at once."

"Was the window open?"

"Yes."

"There was a strong wind that night, might not the wind have blown the lamp out?"

"No, that wasn't it," said Knoll, rising hastily.

"Well, how was it?" asked Muller calmly.

"A hand put out the lamp."

"Whose hand?"

"I couldn't see that. The light was so low on account of the shade that I couldn't see the person who stood there."

"And you don't know whether it was a man or a woman?"

"No, I just saw a hand, more like a shadow it was."

"Well, it doesn't matter much anyway. It was after nine o'clock and many people go to bed about that time," said Muller, who did not see much value in this incident.

But Knoll shook his head. "The person who put out that light didn't go to bed, at least not right away," he said eagerly. "I looked over after a while to the place where the red light was and I saw something else."

"Well, what was it you saw?"

"The window had been closed."

"Who closed it? Didn't you see the person that time? The moonlight lay full on the house."

"Yes, when there weren't any clouds. But there was a heavy cloud over the moon just then and when it came out again the window was shut and there was a white curtain drawn in front of it."

"How could you see that?"

"I could see it when the lamp was lit again."

"Then the lamp was lit again?"

"Yes, I could see the red light behind the curtain."

"And what happened then?"

"Nothing more then, except that the man went through the garden."

Muller rose now and took up his hat. He was evidently excited and Knoll looked at him uneasily. "You're goin' already?" he asked.

"Yes, I have a great deal to do to-day," replied the detective and nodded to the prisoner as he knocked on the door. "I am glad you remembered that," he added, "it will be of use to us, I think."

The warder opened the door, let Muller out, and the heavy iron portal clanged again between Knoll and freedom.

Muller was quite satisfied with the result of his visit to the accused. He hurried to the nearest cab stand and entered one of the carriages waiting there. He gave the driver Mrs. Klingmayer's address. It was about two o'clock in the afternoon now and Muller had had nothing to eat yet. But he was quite unaware of the fact as his mind was so busy that no mere physical sensation could divert his attention for a moment. Muller never seemed to need sleep or food when he was on the trail, particularly not in the fascinating first stages of the case when it was his imagination alone, catching at trifles unnoticed by others, combining them in masterly fashion to an ordered whole, that first led the seekers to the truth. Now he went over once more all the little apparently trivial incidents that had caused him first to watch the Thorne household and then had drawn his attention, and his suspicion, to Adele Bernauer. It was the broken willow twig that had first drawn his attention to the old garden next the Thorne property. This twig, this garden, and perhaps some one who could reach his home again, unseen and unendangered through this garden—might not this have something to do with the murder?

The breaking of the twig was already explained. It was Johann Knoll who had stepped on it. But he had not climbed the wall at all, had only crept along it looking for a night's shelter. And there was no connection between Knoll and the people who lived in the Thorne house. Muller had not the slightest doubt that the tramp had told the entire truth that day and the day preceding.

Then the detective's mind went back to the happenings of Tuesday morning. The little twig had first drawn his attention to the Thorne estate and the people who lived there. He had seen the departure of the young couple and had passed the house again that afternoon and the following day, drawn to it as if by a magnet. He had not been able then to explain what it was that attracted him; there had been nothing definite in his mind as he strolled past the old mansion. But his repeated appearance had been noticed by some one—by one person only—the housekeeper. Why should she have noticed it? Had she any reason for believing that she might be watched? People with an uneasy conscience are very apt to connect even perfectly natural trivial circumstances with their own doings. Adele Bernauer had evidently connected Muller's repeated passing with something that concerned herself even before the detective had thought of her at all.

Muller had not noticed her until he had seen her peculiar conduct that very morning. When he heard Franz's words and saw how disturbed the woman was, he asked himself: "Why did this woman want to be shown the spot of the murder? Didn't she know that place, living so near it, as well as any of the many who stood there staring in morbid curiosity? Did she ask to have it shown her that the others might believe she had nothing whatever to do with the occurrences that had happened there? Or was she drawn thither by that queer attraction that brings the criminal back to the scene of his crime?"

The sudden vision of Mrs. Bernauer's head at the garden gate, and its equally sudden disappearance had attracted Muller's attention and his thoughts to the woman. What he had been able to learn about her had increased his suspicions and her involuntary exclamation when she met him face to face in the house had proved beyond a doubt that there was something on her mind. His open accusation, her demeanour, and finally her swoon, were all links in the chain of evidence that this woman knew something about the murder in the quiet lane.

With this suspicion in his mind what Muller had learned from Knoll was of great value to him, at all events of great interest. Was it the housekeeper who had put out the light? For now Muller did not doubt for a moment that this sudden extinguishing of the lamp was a signal. He believed that Knoll had seen clearly and that he had told truly what he had seen. A lamp that is blown out by the wind flickers uneasily before going out. A sudden extinguishing of the light means human agency. And the lamp was lit again a few moments afterward and burned on steadily as before. A short time after the lamp had been put out the man had been seen going through the garden. And it could not have been much later before the shot was heard. This shot had been fired between the hours of nine and ten, for it was during this hour only that Knoll was in the garden house and heard the shot. But it was not necessary to depend upon the tramp's evidence alone to determine the exact hour of the shot. It must have been before half past nine, or otherwise the janitor of No.1, who came home at that hour and lay awake so long, would undoubtedly have heard a shot fired so near his domicile, in spite of the noise occasioned by the high wind. There would have been sufficient time for Mrs. Bernauer to have reached the place of the murder between the putting out of the lamp and the firing of the shot. But perhaps she may have rested quietly in her room; she may have been only the inciter or the accomplice of the deed. But at all events, she knew something about it, she was in some way connected with it.

Muller drew a deep breath. He felt much easier now that he had arranged his thoughts and marshalled in orderly array all the facts he had already gathered. There was nothing to do now but to follow up a given path step by step and he could no longer reproach himself that he might have cast suspicion on an innocent soul. No, his bearing towards Mrs. Bernauer had not been sheer brutality. His instinct, which had led him so unerringly so many times, had again shown him the right way when he had thrust the accusation in her face.

Now that his mind was easier he realised that he was very hungry. He drove to a restaurant and ordered a hasty meal.

"Beer, sir?' asked the waiter for the third time.

"No," answered Muller, also for the third time.

"Then you'll take wine, sir?" asked the insistent Ganymede.

"Oh, go to the devil! When I want anything I'll ask for it," growled the detective, this time effectively scaring the waiter. It did not often happen that a customer refused drinks, but then there were not many customers who needed as clear, a head as Muller knew he would have to have to-day. Always a light drinker, it was one of his rules never to touch a drop of liquor during this first stage of the mental working out of any new problem which presented itself. But soft-hearted as he was, he repented of his irritation a moment later and soothed the waiter's wounded feelings by a rich tip. The boy ran out to open the cab door for his strange customer and looked after him, wondering whether the man was a cranky millionaire or merely a poet. For Joseph Muller, by name and by reputation one of the best known men in Vienna, was by sight unknown to all except the few with whom he had to do on the police force. His appearance, in every way inconspicuous, and the fact that he never sought acquaintance with any one, was indeed of the greatest possible assistance to him in his work. Many of those who saw him several times in a day would pass him or look him full in the face without recognising him. It was only, as in the case of Mrs. Bernauer, the guilty conscience that remembered face and figure of this quiet-looking man who was one of the most-feared servants of the law in Austria.



CHAPTER IX. THE ELECTRICIAN

When Muller reached the house where Mrs. Klingmayer lived he ordered the cabman to wait and hurried up to the widow's little apartment. He had the key to Leopold Winkler's room in his own pocket, for Mrs. Klingmayer had given this key to Commissioner von Riedau at the latter's request and the commissioner had given it to Muller. The detective told the good woman not to bother about him as he wanted to make an examination of the place alone. Left to himself in the little room, Muller made a thorough search of it, opening the cupboard, the bureau drawers, every possible receptacle where any article could be kept or hidden. What he wanted to find was some letter, some bit of paper, some memoranda perhaps, anything that would show any connection existing between the murdered man and Mrs. Bernauer, who lived so near the place where this man had died and who was so greatly interested in his murder.

The detective's search was not quite in vain, although he could not tell yet whether what he had found would be of any value. Leopold Winkler had had very little correspondence, or else he had had no reason to keep the letters he received. Muller found only about a half dozen letters in all. Three of them were from women of the half-world, giving dates for meetings. Another was written by a man and signed "Theo." This "Theo" appeared to be the same sort of a cheap rounder that Winkler was. And he seemed to have sunk one grade deeper than the dead man, in spite of the latter's bad reputation. For this other addressed Winkler as his "Dear Friend" and pleaded with him for "greater discretion," alluding evidently to something which made this discretion necessary.

"I wonder what rascality it was that made these two friends?" murmured Muller, putting Theo's letter with the three he had already read. But before he slipped it in his pocket he glanced at the postmark. The letters of the three women had all been posted from different quarters of the city some months ago. Theo's letter was postmarked "Marburg," and dated on the 1st of September of the present year.

Then Muller looked at the postmark of the two remaining letters which he had not yet read, and whistled softly to himself. Both these letters were posted from a certain station in Hietzing, the station which was nearest his own lodgings and also nearest the Thorne house. He looked at the postmark more sharply. They both bore the dates of the present year, one of them being stamped "March 17th," the other "September 24th." This last letter interested the detective most.

Muller was not of a nervous disposition, but his hand trembled slightly as he took the letter from its envelope. It was clear that this letter had been torn open hastily, for the edges of the opening were jagged and uneven.

When the detective had read the letter—it contained but a few lines and bore neither address nor signature—he glanced over it once more as if to memorise the words. They were as follows: "Do not come again. In a day or two I will be able to do what I have to do. I will send you later news to your office. Impatience will not help you."—These words were written hastily on a piece of paper that looked as if it had been torn from a pad. In spite of the haste the writer had been at some pains to disguise the handwriting. But it was a clumsy disguise, done by one not accustomed to such tricks, and it was evidently done by a woman. All she had known how to do to disguise her writing had been to twist and turn the paper while writing, so that every letter had a different position. The letters were also made unusually long. This peculiarity of the writing was seen on both letters and both envelopes. The earlier letter was still shorter and seemed to have been written with the same haste, and with the same disgust, or perhaps even hatred, for the man to whom it was written.

"Come to-morrow, but not before eight o'clock. He has gone away. God forgive him and you." This was the contents of the letter of the 17th of March. That is, the writer had penned the letter this way. But the last two words, "and you," had evidently not come from her heart, for she had annulled them by a heavy stroke of the pen. A stroke that seemed like a knife thrust, so full of rage and hate it was.

"So he was called to a rendezvous in Hietzing, too," murmured Muller, then he added after a few moments: "But this rendezvous had nothing whatever to do with love."

There was nothing else in Winkler's room which could be of any value to Muller in the problem that was now before him. And yet he was very well satisfied with the result of his errand.

He entered his cab again, ordering the driver to take him to Hietzing. Just before he had reached the corner where he had told the man to stop, another cab passed them, a coupe, in which was a solitary woman. Muller had just time enough to recognise this woman as Adele Bernauer, and to see that she looked even more haggard and miserable than she had that morning. She did not look up as the other cab passed her carriage, therefore she did not see Muller. The detective looked at his watch and saw that it was almost half-past four. The unexpected meeting changed, his plans for the afternoon. He had decided that he must enter the Thorne mansion again that very day, for he must find out the meaning of the red-shaded lamp. And now that the housekeeper was away it would be easier for him to get into the house, therefore it must be done at once. His excuse was all ready, for he had been weighing possibilities. He dismissed his cab a block from his own home and entered his house cautiously.

Muller's lodgings consisted of two large rooms, really much too large for a lone man who was at home so little. But Muller had engaged them at first sight, for the apartment possessed one qualification which was absolutely necessary for him. Its situation and the arrangement of its doors made it possible for him to enter and leave his rooms without being seen either by his own landlady or by the other lodgers in the house. The little apartment was on the ground floor, and Muller's own rooms had a separate entrance opening on to the main corridor almost immediately behind the door. Nine times out of ten, he could come and go without being seen by any one in the house. To-day was the first time, however, that Muller had had occasion to try this particular qualification of his new lodgings.

He opened the street door and slipped into his own room without having seen or been seen by any one.

Fifteen minutes later he left the apartment again, but left it such a changed man that nobody who had seen him go in would have recognised him. Before he came out, however, he looked about carefully to see whether there was any one in sight He came out unseen and was just closing the main door behind him, when he met the janitress.

"Were you looking for anybody in the house?" said the woman, glancing sharply at the stranger, who answered in a slightly veiled voice: "No, I made a mistake in the number. The place I am looking for is two houses further down."

He walked down the street and the woman looked after him until she saw him turn into the doorway of the second house. Then she went into her own rooms. The house Muller entered happened to be a corner house with an entrance on the other street, through which the detective passed and went on his way. He was quite satisfied with the security of his disguise, for the woman who knew him well had not recognised him at all. If his own janitress did not know him, the people in the Thorne house would never imagine it was he.

And indeed Muller was entirely changed. In actuality small and thin, with sparse brown hair and smooth shaven face, he was now an inch or two taller and very much stouter. He wore thick curly blond hair, a little pointed blond beard and moustache. His eyes were hidden by heavy-rimmed spectacles.

It was just half-past five when he rang the bell at the entrance gate to the Thorne property. He had spent the intervening time in the cafe, as he was in no hurry to enter the house. Franz came down the path and opened the door. "'What do you want?" he asked.

"I come from Siemens & Halske; I was to ask whether the other man—"

"Has been here already?" interrupted Franz, adding in an irritated tone, "No, he hasn't been here at all."

"Well, I guess he didn't get through at the other place in time. I'll see what the trouble is," said the stranger, whom Franz naturally supposed to be the electrician, lie opened the gate and asked the other to come in, leading him into the house. Under a cloudy sky the day was fading rapidly. Muller knew that it would not occur to the real electrician to begin any work as late as this, and that he was perfectly safe in the examination he wanted to make.

"Well, what's the trouble here? Why did you write to our firm?" asked the supposed electrician.

"The wires must cross somewhere, or there's something wrong with the bells. When the housekeeper touches the button in her room to ring for the cook or the upstairs girl, the bell rings in Mr. Thorne's room. It starts ringing and it keeps up with a deuce of a noise. Fortunately the family are away."

"Well, we'll fix it all right for you. First of all I want to look at the button in the housekeeper's room."

"I'll take you up there," said Franz.

They walked through the wide corridor, then turned into a shorter, darker hall and went up a narrow winding stairway. Franz halted before a door in the second story. It was the last of the three doors in the hall. Muller took off his hat as the door opened and murmured a "good-evening."

"There's no one there; Mrs. Bernaner's out."

"Has she gone away, too?" asked the electrician hastily.

Franz did not notice that there was a slight change in the stranger's voice at this question, and he answered calmly as ever: "Oh, no; she's just driven to town. I think she went to see the doctor who lives quite a distance away. She hasn't been feeling at all well. She took a cab to-day. I told her she ought to, as she wasn't well enough to go by the tram. She ought to be home any moment now."

"Well, I'll hurry up with the job so that I'll be out of the way when the lady comes," said Muller, as Franz led him to the misbehaving bell.

It was in the wall immediately above a large table which filled the window niche so completely that there was but scant space left for the comfortable armchair that stood in front of it. The window was open and Muller leaned out, looking down at the garden below.

"What a fine old garden!" he exclaimed aloud. To himself he said: "This is the last window in the left wing. It is the window where Johann Knoll saw the red light."

And when he turned back into the room again he found the source of this light right at his hand on the handsome old table at which Mrs. Bernauer evidently spent many of her hours. A row of books stood against the wall, framing the back of the table. Well-worn volumes of the classics among them gave proof that the one-time nurse was a woman of education. A sewing basket and neat piles of house linen, awaiting repairs, covered a large part of the table-top, and beside them stood a gracefully shaped lamp, covered by a shade of soft red silk.

It took Muller but a few seconds to see all this. Then he set about his investigation of the electric button. He unscrewed the plate and examined the wires meeting under it. While doing so he cast another glance at the table and saw a letter lying there, an open letter half out of its envelope. This envelope was of unusual shape, long and narrow, and the paper was heavy and high-glossed.

"Your housekeeper evidently has no secrets from the rest of you," Muller remarked with a laugh, still busy at the wires, "or she wouldn't leave her letters lying about like that."

"Oh, we've all heard what's in that letter," replied Franz. "She read it to us when it came this morning. It's from the Madam. She sent messages to all of us and orders, so Mrs. Bernauer read us the whole letter. There's no secrets in that."

"The button has been pressed in too far and caught down. That seems to be the main trouble," said Muller, readjusting the little knob. "I'd like a candle here if I may have one."

"I'll get you a light at once," said Franz. But his intentions, however excellent, seemed difficult of fulfilment. It was rapidly growing dark, and the old butler peered about uncertainly. "Stupid," he muttered. "I don't know where she keeps the matches. I can't find them anywhere. I'm not a smoker, so I haven't any in my pocket."

"Nor I," said Muller calmly, letting his hand close protectingly over a new full box of them in his own pocket.

"I'll get you some from my own room," and Franz hurried away, his loose slippers clattering down the stairs. He was no sooner well out of the room than Muller had the letter in his hand and was standing close by the window to catch the fading light. But on the old servant's return the supposed electrician stood calmly awaiting the coming of the light, and the letter was back on the table half hidden by a piece of linen. Franz did not notice that the envelope was missing. And the housekeeper, whose mind was so upset by the events of the day, and whose thoughts were on other more absorbing matters, would hardly be likely to remember whether she had returned this quite unimportant letter to its envelope or not.

Franz brought a lighted candle with him, and Muller, who really did possess a creditable knowledge of electricity, saw that the wires in the room were all in good condition. As he had seen at first, there was really nothing the matter except with the position of the button. But it did not suit his purpose to enlighten Franz on the matter just yet.

"Now I'd better look at the wires in the gentleman's room," he said, when he had returned plate and button to their place.

"Just as you say," replied Franz, taking up his candle and leading the way out into the hail and down the winding stair. They crossed the lower corridor, mounted another staircase and entered a large, handsomely furnished room, half studio, half library. The wall was covered with pictures and sketches, several easels stood piled up in the corner, and a broad table beside them held paint boxes, colour tubes, brushes, all the paraphernalia of the painter, now carefully ordered and covered for a term of idleness. Great bookcases towered to the ceiling, and a huge flat top desk, a costly piece of furniture, was covered with books and papers. It was the room of a man of brains and breeding, a man of talent and ability, possessing, furthermore, the means to indulge his tastes freely. Even now, with its master absent, the handsome apartment bore the impress of his personality. The detective's quick imagination called up the attractive, sympathetic figure of the man he had seen at the gate, as his quick eye took in the details of the room. All the charm of Herbert Thorne's personality, which the keen-sensed Muller had felt so strongly even in that fleeting glimpse of him, came back again here in the room which was his own little kingdom and the expression of his mentality.

"Well, what's the trouble here? Where are the wires?" asked the detective, after the momentary pause which had followed his entrance into the room. Franz led him to a spot on the wall hidden by a marquetry cabinet. "Here's the bell, it rings for several minutes before it stops."

The light of the candle which the butler held fell upon a portrait hanging above the cabinet. It was a sketch in water-colours, the life-sized head of a man who may have been about thirty years old, perhaps, but who had none of the freshness and vigour of youth. The scanty hair, the sunken temples, and the faded skin, emphasised the look of dissipation given by the lines about the sensual mouth and the shifty eyes.

"Well, say, can't your master find anything better to paint than a face like that?" Muller asked with a laugh.

"Goodness me! you mustn't say such things!" exclaimed Franz in alarm; "that's the Madam's brother. He's an officer, I'd have you know. It's true, he doesn't look like much there, but that's because he's not in uniform. It makes such a difference."

"Is the lady anything like her brother?" asked the detective indifferently, bending to examine the wiring.

"Oh, dear, no, not a bit; they're as different as day and night. He's only her half-brother anyway. She was the daughter of the Colonel's second wife. Our Madam is the sweetest, gentlest lady you can imagine, an angel of goodness. But the Lieutenant here has always been a care to his family, they say. I guess he's quieted down a bit now, for his father—he's Colonel Leining, retired—made him get exchanged from the city to a small garrison town. There's nothing much to do in Marburg, I dare say—well! you are a merry sort, aren't you?" These last words, spoken in a tone of surprise, were called forth by a sudden sharp whistle from the detective, a whistle which went off into a few merry bars.

A sudden whistle like that from Muller's lips was something that made the Imperial Police Force sit up and take notice, for it meant that things were happening, and that the happenings were likely to become exciting. It was a habit he could control only by the severest effort of the will, an effort which he kept for occasions when it was absolutely necessary. Here, alone with the harmless old man, he was not so much on his guard, and the sudden vibrating of every nerve at the word "Marburg," found vent in the whistle which surprised old Franz. One young police commissioner with a fancy for metaphor had likened this sudden involuntary whistle of Muller's to the bay of the hound when he strikes the trail; which was about what it was.

"Yes, I am merry sometimes," he said with a laugh. "It's a habit I have. Something occurred to me just then, something I had forgotten. Hope you don't mind."

"Oh, no, there's no one here now, whistle all you like."

But Muller's whistle was not a continuous performance, and he had now completely mastered the excitation of his nerves which had called it forth. He threw another sharp look at the picture of the man who lived in Marburg, and then asked: "And now where is the button?"

"By the window there, beside the desk." Franz led the way with his candle.

"Why, how funny! What are those mirrors there for?" asked the electrician in a tone of surprise, pointing to two small mirrors hanging in the window niche. They were placed at a height and at such a peculiar angle that no one could possibly see his face in them.

"Something the master is experimenting with, I guess. He's always making queer experiments; he knows a lot about scientific things."

Muller shook his head as if in wonderment, and bent to investigate the button which was fastened into the wall beneath the window sill. His quick ear heard a carriage stopping in front of the house, and heard the closing of the front door a moment later. To facilitate his examination of the button, the detective had seated himself in the armchair which stood beside the desk. He half raised himself now to let the light of the candle fall more clearly on the wiring—then he started up altogether and threw a hasty glance at the mirrors above his head. A ray of light had suddenly flashed down upon him—a ray of red light, and it came reflected from the mirrors. Muller bit his lips to keep back the betraying whistle.

"What's the matter?" asked the butler. "Did you drop anything?"

"Yes, the wooden rim of the button," replied Muller, telling the truth this time. For he had held the little wooden circlet in his hands at the moment when the red light, reflected down from the mirrors, struck full upon his eyes. He had dropped it in his surprise and excitement. Franz found the little ring in the centre of the room where it had rolled, and the supposed electrician replaced it and rose to his feet, saying: "There, I've finished now."

Franz did not recognise the double meaning in the words. "Yes, it's all right! I've finished here now," Muller repeated to himself. For now he knew beyond a doubt that the red light was a signal—and he knew also for whom this signal was intended. It was a signal for Herbert Thorne!—Herbert Thorne, whom no single thought or suspicion of Muller's had yet connected with the murder of Leopold Winkler.

The detective was very much surprised and greatly excited. But Franz did not notice it, and indeed a far keener observer than the slow-witted old butler might have failed to see the sudden gleam which shot up in the grey eyes behind the heavy spectacles, might have failed to notice the tightening of the lips beneath the blond moustache, or the tenseness of the slight frame under the assumed embonpoint. Muller's every nerve was tingling, but he had himself completely in hand.