Whittaker brightened up. 'It's a chance,' he said. 'Let's go over to the Admiralty.'

We got into two of the waiting motor-cars—all but Sir Walter, who went off to Scotland Yard—to 'mobilize MacGillivray', so he said. We marched through empty corridors and big bare chambers where the charwomen were busy, till we reached a little room lined with books and maps. A resident clerk was unearthed, who presently fetched from the library the Admiralty Tide Tables. I sat at the desk and the others stood round, for somehow or other I had got charge of this expedition.

It was no good. There were hundreds of entries, and so far as I could see 10.17 might cover fifty places. We had to find some way of narrowing the possibilities.

I took my head in my hands and thought. There must be some way of reading this riddle. What did Scudder mean by steps? I thought of dock steps, but if he had meant that I didn't think he would have mentioned the number. It must be some place where there were several staircases, and one marked out from the others by having thirty-nine steps.

Then I had a sudden thought, and hunted up all the steamer sailings. There was no boat which left for the Continent at 10.17 p.m.

Why was high tide so important? If it was a harbour it must be some little place where the tide mattered, or else it was a heavy-draught boat. But there was no regular steamer sailing at that hour, and somehow I didn't think they would travel by a big boat from a regular harbour. So it must be some little harbour where the tide was important, or perhaps no harbour at all.

But if it was a little port I couldn't see what the steps signified. There were no sets of staircases on any harbour that I had ever seen. It must be some place which a particular staircase identified, and where the tide was full at 10.17. On the whole it seemed to me that the place must be a bit of open coast. But the staircases kept puzzling me.

Then I went back to wider considerations. Whereabouts would a man be likely to leave for Germany, a man in a hurry, who wanted a speedy and a secret passage? Not from any of the big harbours. And not from the Channel or the West Coast or Scotland, for, remember, he was starting from London. I measured the distance on the map, and tried to put myself in the enemy's shoes. I should try for Ostend or Antwerp or Rotterdam, and I should sail from somewhere on the East Coast between Cromer and Dover.

All this was very loose guessing, and I don't pretend it was ingenious or scientific. I wasn't any kind of Sherlock Holmes. But I have always fancied I had a kind of instinct about questions like this. I don't know if I can explain myself, but I used to use my brains as far as they went, and after they came to a blank wall I guessed, and I usually found my guesses pretty right.

So I set out all my conclusions on a bit of Admiralty paper. They ran like this:

FAIRLY CERTAIN

(1) Place where there are several sets of stairs; one that matters distinguished by having thirty-nine steps.

(2) Full tide at 10.17 p.m. Leaving shore only possible at full tide.

(3) Steps not dock steps, and so place probably not harbour.

(4) No regular night steamer at 10.17. Means of transport must be tramp (unlikely), yacht, or fishing-boat.

There my reasoning stopped. I made another list, which I headed 'Guessed', but I was just as sure of the one as the other.

GUESSED

(1) Place not harbour but open coast.

(2) Boat small—trawler, yacht, or launch.

(3) Place somewhere on East Coast between Cromer and Dover.

It struck me as odd that I should be sitting at that desk with a Cabinet Minister, a Field-Marshal, two high Government officials, and a French General watching me, while from the scribble of a dead man I was trying to drag a secret which meant life or death for us.

Sir Walter had joined us, and presently MacGillivray arrived. He had sent out instructions to watch the ports and railway stations for the three men whom I had described to Sir Walter. Not that he or anybody else thought that that would do much good.

'Here's the most I can make of it,' I said. 'We have got to find a place where there are several staircases down to the beach, one of which has thirty-nine steps. I think it's a piece of open coast with biggish cliffs, somewhere between the Wash and the Channel. Also it's a place where full tide is at 10.17 tomorrow night.'

Then an idea struck me. 'Is there no Inspector of Coastguards or some fellow like that who knows the East Coast?'

Whittaker said there was, and that he lived in Clapham. He went off in a car to fetch him, and the rest of us sat about the little room and talked of anything that came into our heads. I lit a pipe and went over the whole thing again till my brain grew weary.

About one in the morning the coastguard man arrived. He was a fine old fellow, with the look of a naval officer, and was desperately respectful to the company. I left the War Minister to cross-examine him, for I felt he would think it cheek in me to talk.

'We want you to tell us the places you know on the East Coast where there are cliffs, and where several sets of steps run down to the beach.'

He thought for a bit. 'What kind of steps do you mean, Sir? There are plenty of places with roads cut down through the cliffs, and most roads have a step or two in them. Or do you mean regular staircases—all steps, so to speak?'

Sir Arthur looked towards me. 'We mean regular staircases,' I said.

He reflected a minute or two. 'I don't know that I can think of any. Wait a second. There's a place in Norfolk—Brattlesham—beside a golf-course, where there are a couple of staircases, to let the gentlemen get a lost ball.'

'That's not it,' I said.

'Then there are plenty of Marine Parades, if that's what you mean. Every seaside resort has them.'

I shook my head. 'It's got to be more retired than that,' I said.

'Well, gentlemen, I can't think of anywhere else. Of course, there's the Ruff—'

'What's that?' I asked.

'The big chalk headland in Kent, close to Bradgate. It's got a lot of villas on the top, and some of the houses have staircases down to a private beach. It's a very high-toned sort of place, and the residents there like to keep by themselves.'

I tore open the Tide Tables and found Bradgate. High tide there was at 10.17 P.m. on the 15th of June.

'We're on the scent at last,' I cried excitedly. 'How can I find out what is the tide at the Ruff?'

'I can tell you that, Sir,' said the coastguard man. 'I once was lent a house there in this very month, and I used to go out at night to the deep-sea fishing. The tide's ten minutes before Bradgate.'

I closed the book and looked round at the company.

'If one of those staircases has thirty-nine steps we have solved the mystery, gentlemen,' I said. 'I want the loan of your car, Sir Walter, and a map of the roads. If Mr MacGillivray will spare me ten minutes, I think we can prepare something for tomorrow.'

It was ridiculous in me to take charge of the business like this, but they didn't seem to mind, and after all I had been in the show from the start. Besides, I was used to rough jobs, and these eminent gentlemen were too clever not to see it. It was General Royer who gave me my commission. 'I for one,' he said, 'am content to leave the matter in Mr Hannay's hands.'

By half-past three I was tearing past the moonlit hedgerows of Kent, with MacGillivray's best man on the seat beside me.



CHAPTER TEN

Various Parties Converging on the Sea

A pink and blue June morning found me at Bradgate looking from the Griffin Hotel over a smooth sea to the lightship on the Cock sands which seemed the size of a bell-buoy. A couple of miles farther south and much nearer the shore a small destroyer was anchored. Scaife, MacGillivray's man, who had been in the Navy, knew the boat, and told me her name and her commander's, so I sent off a wire to Sir Walter.

After breakfast Scaife got from a house-agent a key for the gates of the staircases on the Ruff. I walked with him along the sands, and sat down in a nook of the cliffs while he investigated the half-dozen of them. I didn't want to be seen, but the place at this hour was quite deserted, and all the time I was on that beach I saw nothing but the sea-gulls.

It took him more than an hour to do the job, and when I saw him coming towards me, conning a bit of paper, I can tell you my heart was in my mouth. Everything depended, you see, on my guess proving right.

He read aloud the number of steps in the different stairs. 'Thirty-four, thirty-five, thirty-nine, forty-two, forty-seven,' and 'twenty-one' where the cliffs grew lower. I almost got up and shouted.

We hurried back to the town and sent a wire to MacGillivray. I wanted half a dozen men, and I directed them to divide themselves among different specified hotels. Then Scaife set out to prospect the house at the head of the thirty-nine steps.

He came back with news that both puzzled and reassured me. The house was called Trafalgar Lodge, and belonged to an old gentleman called Appleton—a retired stockbroker, the house-agent said. Mr Appleton was there a good deal in the summer time, and was in residence now—had been for the better part of a week. Scaife could pick up very little information about him, except that he was a decent old fellow, who paid his bills regularly, and was always good for a fiver for a local charity. Then Scaife seemed to have penetrated to the back door of the house, pretending he was an agent for sewing-machines. Only three servants were kept, a cook, a parlour-maid, and a housemaid, and they were just the sort that you would find in a respectable middle-class household. The cook was not the gossiping kind, and had pretty soon shut the door in his face, but Scaife said he was positive she knew nothing. Next door there was a new house building which would give good cover for observation, and the villa on the other side was to let, and its garden was rough and shrubby.

I borrowed Scaife's telescope, and before lunch went for a walk along the Ruff. I kept well behind the rows of villas, and found a good observation point on the edge of the golf-course. There I had a view of the line of turf along the cliff top, with seats placed at intervals, and the little square plots, railed in and planted with bushes, whence the staircases descended to the beach. I saw Trafalgar Lodge very plainly, a red-brick villa with a veranda, a tennis lawn behind, and in front the ordinary seaside flower-garden full of marguerites and scraggy geraniums. There was a flagstaff from which an enormous Union Jack hung limply in the still air.

Presently I observed someone leave the house and saunter along the cliff. When I got my glasses on him I saw it was an old man, wearing white flannel trousers, a blue serge jacket, and a straw hat. He carried field-glasses and a newspaper, and sat down on one of the iron seats and began to read. Sometimes he would lay down the paper and turn his glasses on the sea. He looked for a long time at the destroyer. I watched him for half an hour, till he got up and went back to the house for his luncheon, when I returned to the hotel for mine.

I wasn't feeling very confident. This decent common-place dwelling was not what I had expected. The man might be the bald archaeologist of that horrible moorland farm, or he might not. He was exactly the kind of satisfied old bird you will find in every suburb and every holiday place. If you wanted a type of the perfectly harmless person you would probably pitch on that.

But after lunch, as I sat in the hotel porch, I perked up, for I saw the thing I had hoped for and had dreaded to miss. A yacht came up from the south and dropped anchor pretty well opposite the Ruff. She seemed about a hundred and fifty tons, and I saw she belonged to the Squadron from the white ensign. So Scaife and I went down to the harbour and hired a boatman for an afternoon's fishing.

I spent a warm and peaceful afternoon. We caught between us about twenty pounds of cod and lythe, and out in that dancing blue sea I took a cheerier view of things. Above the white cliffs of the Ruff I saw the green and red of the villas, and especially the great flagstaff of Trafalgar Lodge. About four o'clock, when we had fished enough, I made the boatman row us round the yacht, which lay like a delicate white bird, ready at a moment to flee. Scaife said she must be a fast boat for her build, and that she was pretty heavily engined.

Her name was the ARIADNE, as I discovered from the cap of one of the men who was polishing brasswork. I spoke to him, and got an answer in the soft dialect of Essex. Another hand that came along passed me the time of day in an unmistakable English tongue. Our boatman had an argument with one of them about the weather, and for a few minutes we lay on our oars close to the starboard bow.

Then the men suddenly disregarded us and bent their heads to their work as an officer came along the deck. He was a pleasant, clean-looking young fellow, and he put a question to us about our fishing in very good English. But there could be no doubt about him. His close-cropped head and the cut of his collar and tie never came out of England.

That did something to reassure me, but as we rowed back to Bradgate my obstinate doubts would not be dismissed. The thing that worried me was the reflection that my enemies knew that I had got my knowledge from Scudder, and it was Scudder who had given me the clue to this place. If they knew that Scudder had this clue, would they not be certain to change their plans? Too much depended on their success for them to take any risks. The whole question was how much they understood about Scudder's knowledge. I had talked confidently last night about Germans always sticking to a scheme, but if they had any suspicions that I was on their track they would be fools not to cover it. I wondered if the man last night had seen that I recognized him. Somehow I did not think he had, and to that I had clung. But the whole business had never seemed so difficult as that afternoon when by all calculations I should have been rejoicing in assured success.

In the hotel I met the commander of the destroyer, to whom Scaife introduced me, and with whom I had a few words. Then I thought I would put in an hour or two watching Trafalgar Lodge.

I found a place farther up the hill, in the garden of an empty house. From there I had a full view of the court, on which two figures were having a game of tennis. One was the old man, whom I had already seen; the other was a younger fellow, wearing some club colours in the scarf round his middle. They played with tremendous zest, like two city gents who wanted hard exercise to open their pores. You couldn't conceive a more innocent spectacle. They shouted and laughed and stopped for drinks, when a maid brought out two tankards on a salver. I rubbed my eyes and asked myself if I was not the most immortal fool on earth. Mystery and darkness had hung about the men who hunted me over the Scotch moor in aeroplane and motor-car, and notably about that infernal antiquarian. It was easy enough to connect those folk with the knife that pinned Scudder to the floor, and with fell designs on the world's peace. But here were two guileless citizens taking their innocuous exercise, and soon about to go indoors to a humdrum dinner, where they would talk of market prices and the last cricket scores and the gossip of their native Surbiton. I had been making a net to catch vultures and falcons, and lo and behold! two plump thrushes had blundered into it.

Presently a third figure arrived, a young man on a bicycle, with a bag of golf-clubs slung on his back. He strolled round to the tennis lawn and was welcomed riotously by the players. Evidently they were chaffing him, and their chaff sounded horribly English. Then the plump man, mopping his brow with a silk handkerchief, announced that he must have a tub. I heard his very words—'I've got into a proper lather,' he said. 'This will bring down my weight and my handicap, Bob. I'll take you on tomorrow and give you a stroke a hole.' You couldn't find anything much more English than that.

They all went into the house, and left me feeling a precious idiot. I had been barking up the wrong tree this time. These men might be acting; but if they were, where was their audience? They didn't know I was sitting thirty yards off in a rhododendron. It was simply impossible to believe that these three hearty fellows were anything but what they seemed—three ordinary, game-playing, suburban Englishmen, wearisome, if you like, but sordidly innocent.

And yet there were three of them; and one was old, and one was plump, and one was lean and dark; and their house chimed in with Scudder's notes; and half a mile off was lying a steam yacht with at least one German officer. I thought of Karolides lying dead and all Europe trembling on the edge of earthquake, and the men I had left behind me in London who were waiting anxiously for the events of the next hours. There was no doubt that hell was afoot somewhere. The Black Stone had won, and if it survived this June night would bank its winnings.

There seemed only one thing to do—go forward as if I had no doubts, and if I was going to make a fool of myself to do it handsomely. Never in my life have I faced a job with greater disinclination. I would rather in my then mind have walked into a den of anarchists, each with his Browning handy, or faced a charging lion with a popgun, than enter that happy home of three cheerful Englishmen and tell them that their game was up. How they would laugh at me!

But suddenly I remembered a thing I once heard in Rhodesia from old Peter Pienaar. I have quoted Peter already in this narrative. He was the best scout I ever knew, and before he had turned respectable he had been pretty often on the windy side of the law, when he had been wanted badly by the authorities. Peter once discussed with me the question of disguises, and he had a theory which struck me at the time. He said, barring absolute certainties like fingerprints, mere physical traits were very little use for identification if the fugitive really knew his business. He laughed at things like dyed hair and false beards and such childish follies. The only thing that mattered was what Peter called 'atmosphere'.

If a man could get into perfectly different surroundings from those in which he had been first observed, and—this is the important part—really play up to these surroundings and behave as if he had never been out of them, he would puzzle the cleverest detectives on earth. And he used to tell a story of how he once borrowed a black coat and went to church and shared the same hymn-book with the man that was looking for him. If that man had seen him in decent company before he would have recognized him; but he had only seen him snuffing the lights in a public-house with a revolver.

The recollection of Peter's talk gave me the first real comfort that I had had that day. Peter had been a wise old bird, and these fellows I was after were about the pick of the aviary. What if they were playing Peter's game? A fool tries to look different: a clever man looks the same and is different.

Again, there was that other maxim of Peter's which had helped me when I had been a roadman. 'If you are playing a part, you will never keep it up unless you convince yourself that you are it.' That would explain the game of tennis. Those chaps didn't need to act, they just turned a handle and passed into another life, which came as naturally to them as the first. It sounds a platitude, but Peter used to say that it was the big secret of all the famous criminals.

It was now getting on for eight o'clock, and I went back and saw Scaife to give him his instructions. I arranged with him how to place his men, and then I went for a walk, for I didn't feel up to any dinner. I went round the deserted golf-course, and then to a point on the cliffs farther north beyond the line of the villas.

On the little trim newly-made roads I met people in flannels coming back from tennis and the beach, and a coastguard from the wireless station, and donkeys and pierrots padding homewards. Out at sea in the blue dusk I saw lights appear on the ARIADNE and on the destroyer away to the south, and beyond the Cock sands the bigger lights of steamers making for the Thames. The whole scene was so peaceful and ordinary that I got more dashed in spirits every second. It took all my resolution to stroll towards Trafalgar Lodge about half-past nine.

On the way I got a piece of solid comfort from the sight of a greyhound that was swinging along at a nursemaid's heels. He reminded me of a dog I used to have in Rhodesia, and of the time when I took him hunting with me in the Pali hills. We were after rhebok, the dun kind, and I recollected how we had followed one beast, and both he and I had clean lost it. A greyhound works by sight, and my eyes are good enough, but that buck simply leaked out of the landscape. Afterwards I found out how it managed it. Against the grey rock of the kopjes it showed no more than a crow against a thundercloud. It didn't need to run away; all it had to do was to stand still and melt into the background.

Suddenly as these memories chased across my brain I thought of my present case and applied the moral. The Black Stone didn't need to bolt. They were quietly absorbed into the landscape. I was on the right track, and I jammed that down in my mind and vowed never to forget it. The last word was with Peter Pienaar.

Scaife's men would be posted now, but there was no sign of a soul. The house stood as open as a market-place for anybody to observe. A three-foot railing separated it from the cliff road; the windows on the ground-floor were all open, and shaded lights and the low sound of voices revealed where the occupants were finishing dinner. Everything was as public and above-board as a charity bazaar. Feeling the greatest fool on earth, I opened the gate and rang the bell.

A man of my sort, who has travelled about the world in rough places, gets on perfectly well with two classes, what you may call the upper and the lower. He understands them and they understand him. I was at home with herds and tramps and roadmen, and I was sufficiently at my ease with people like Sir Walter and the men I had met the night before. I can't explain why, but it is a fact. But what fellows like me don't understand is the great comfortable, satisfied middle-class world, the folk that live in villas and suburbs. He doesn't know how they look at things, he doesn't understand their conventions, and he is as shy of them as of a black mamba. When a trim parlour-maid opened the door, I could hardly find my voice.

I asked for Mr Appleton, and was ushered in. My plan had been to walk straight into the dining-room, and by a sudden appearance wake in the men that start of recognition which would confirm my theory. But when I found myself in that neat hall the place mastered me. There were the golf-clubs and tennis-rackets, the straw hats and caps, the rows of gloves, the sheaf of walking-sticks, which you will find in ten thousand British homes. A stack of neatly folded coats and waterproofs covered the top of an old oak chest; there was a grandfather clock ticking; and some polished brass warming-pans on the walls, and a barometer, and a print of Chiltern winning the St Leger. The place was as orthodox as an Anglican church. When the maid asked me for my name I gave it automatically, and was shown into the smoking-room, on the right side of the hall.

That room was even worse. I hadn't time to examine it, but I could see some framed group photographs above the mantelpiece, and I could have sworn they were English public school or college. I had only one glance, for I managed to pull myself together and go after the maid. But I was too late. She had already entered the dining-room and given my name to her master, and I had missed the chance of seeing how the three took it.

When I walked into the room the old man at the head of the table had risen and turned round to meet me. He was in evening dress—a short coat and black tie, as was the other, whom I called in my own mind the plump one. The third, the dark fellow, wore a blue serge suit and a soft white collar, and the colours of some club or school.

The old man's manner was perfect. 'Mr Hannay?' he said hesitatingly. 'Did you wish to see me? One moment, you fellows, and I'll rejoin you. We had better go to the smoking-room.'

Though I hadn't an ounce of confidence in me, I forced myself to play the game. I pulled up a chair and sat down on it.

'I think we have met before,' I said, 'and I guess you know my business.'

The light in the room was dim, but so far as I could see their faces, they played the part of mystification very well.

'Maybe, maybe,' said the old man. 'I haven't a very good memory, but I'm afraid you must tell me your errand, Sir, for I really don't know it.'

'Well, then,' I said, and all the time I seemed to myself to be talking pure foolishness—'I have come to tell you that the game's up. I have a warrant for the arrest of you three gentlemen.'

'Arrest,' said the old man, and he looked really shocked. 'Arrest! Good God, what for?'

'For the murder of Franklin Scudder in London on the 23rd day of last month.'

'I never heard the name before,' said the old man in a dazed voice.

One of the others spoke up. 'That was the Portland Place murder. I read about it. Good heavens, you must be mad, Sir! Where do you come from?'

'Scotland Yard,' I said.

After that for a minute there was utter silence. The old man was staring at his plate and fumbling with a nut, the very model of innocent bewilderment.

Then the plump one spoke up. He stammered a little, like a man picking his words.

'Don't get flustered, uncle,' he said. 'It is all a ridiculous mistake; but these things happen sometimes, and we can easily set it right. It won't be hard to prove our innocence. I can show that I was out of the country on the 23rd of May, and Bob was in a nursing home. You were in London, but you can explain what you were doing.'

'Right, Percy! Of course that's easy enough. The 23rd! That was the day after Agatha's wedding. Let me see. What was I doing? I came up in the morning from Woking, and lunched at the club with Charlie Symons. Then—oh yes, I dined with the Fishmongers. I remember, for the punch didn't agree with me, and I was seedy next morning. Hang it all, there's the cigar-box I brought back from the dinner.' He pointed to an object on the table, and laughed nervously.

'I think, Sir,' said the young man, addressing me respectfully, 'you will see you are mistaken. We want to assist the law like all Englishmen, and we don't want Scotland Yard to be making fools of themselves. That's so, uncle?'

'Certainly, Bob.' The old fellow seemed to be recovering his voice. 'Certainly, we'll do anything in our power to assist the authorities. But—but this is a bit too much. I can't get over it.'

'How Nellie will chuckle,' said the plump man. 'She always said that you would die of boredom because nothing ever happened to you. And now you've got it thick and strong,' and he began to laugh very pleasantly.

'By Jove, yes. Just think of it! What a story to tell at the club. Really, Mr Hannay, I suppose I should be angry, to show my innocence, but it's too funny! I almost forgive you the fright you gave me! You looked so glum, I thought I might have been walking in my sleep and killing people.'

It couldn't be acting, it was too confoundedly genuine. My heart went into my boots, and my first impulse was to apologize and clear out. But I told myself I must see it through, even though I was to be the laughing-stock of Britain. The light from the dinner-table candlesticks was not very good, and to cover my confusion I got up, walked to the door and switched on the electric light. The sudden glare made them blink, and I stood scanning the three faces.

Well, I made nothing of it. One was old and bald, one was stout, one was dark and thin. There was nothing in their appearance to prevent them being the three who had hunted me in Scotland, but there was nothing to identify them. I simply can't explain why I who, as a roadman, had looked into two pairs of eyes, and as Ned Ainslie into another pair, why I, who have a good memory and reasonable powers of observation, could find no satisfaction. They seemed exactly what they professed to be, and I could not have sworn to one of them.

There in that pleasant dining-room, with etchings on the walls, and a picture of an old lady in a bib above the mantelpiece, I could see nothing to connect them with the moorland desperadoes. There was a silver cigarette-box beside me, and I saw that it had been won by Percival Appleton, Esq., of the St Bede's Club, in a golf tournament. I had to keep a firm hold of Peter Pienaar to prevent myself bolting out of that house.

'Well,' said the old man politely, 'are you reassured by your scrutiny, Sir?'

I couldn't find a word.

'I hope you'll find it consistent with your duty to drop this ridiculous business. I make no complaint, but you'll see how annoying it must be to respectable people.'

I shook my head.

'O Lord,' said the young man. 'This is a bit too thick!'

'Do you propose to march us off to the police station?' asked the plump one. 'That might be the best way out of it, but I suppose you won't be content with the local branch. I have the right to ask to see your warrant, but I don't wish to cast any aspersions upon you. You are only doing your duty. But you'll admit it's horribly awkward. What do you propose to do?'

There was nothing to do except to call in my men and have them arrested, or to confess my blunder and clear out. I felt mesmerized by the whole place, by the air of obvious innocence—not innocence merely, but frank honest bewilderment and concern in the three faces.

'Oh, Peter Pienaar,' I groaned inwardly, and for a moment I was very near damning myself for a fool and asking their pardon.

'Meantime I vote we have a game of bridge,' said the plump one. 'It will give Mr Hannay time to think over things, and you know we have been wanting a fourth player. Do you play, Sir?'

I accepted as if it had been an ordinary invitation at the club. The whole business had mesmerized me. We went into the smoking-room where a card-table was set out, and I was offered things to smoke and drink. I took my place at the table in a kind of dream. The window was open and the moon was flooding the cliffs and sea with a great tide of yellow light. There was moonshine, too, in my head. The three had recovered their composure, and were talking easily—just the kind of slangy talk you will hear in any golf club-house. I must have cut a rum figure, sitting there knitting my brows with my eyes wandering.

My partner was the young dark one. I play a fair hand at bridge, but I must have been rank bad that night. They saw that they had got me puzzled, and that put them more than ever at their ease. I kept looking at their faces, but they conveyed nothing to me. It was not that they looked different; they were different. I clung desperately to the words of Peter Pienaar.

Then something awoke me.

The old man laid down his hand to light a cigar. He didn't pick it up at once, but sat back for a moment in his chair, with his fingers tapping on his knees.

It was the movement I remembered when I had stood before him in the moorland farm, with the pistols of his servants behind me.

A little thing, lasting only a second, and the odds were a thousand to one that I might have had my eyes on my cards at the time and missed it. But I didn't, and, in a flash, the air seemed to clear. Some shadow lifted from my brain, and I was looking at the three men with full and absolute recognition.

The clock on the mantelpiece struck ten o'clock.

The three faces seemed to change before my eyes and reveal their secrets. The young one was the murderer. Now I saw cruelty and ruthlessness, where before I had only seen good-humour. His knife, I made certain, had skewered Scudder to the floor. His kind had put the bullet in Karolides.

The plump man's features seemed to dislimn, and form again, as I looked at them. He hadn't a face, only a hundred masks that he could assume when he pleased. That chap must have been a superb actor. Perhaps he had been Lord Alloa of the night before; perhaps not; it didn't matter. I wondered if he was the fellow who had first tracked Scudder, and left his card on him. Scudder had said he lisped, and I could imagine how the adoption of a lisp might add terror.

But the old man was the pick of the lot. He was sheer brain, icy, cool, calculating, as ruthless as a steam hammer. Now that my eyes were opened I wondered where I had seen the benevolence. His jaw was like chilled steel, and his eyes had the inhuman luminosity of a bird's. I went on playing, and every second a greater hate welled up in my heart. It almost choked me, and I couldn't answer when my partner spoke. Only a little longer could I endure their company.

'Whew! Bob! Look at the time,' said the old man. 'You'd better think about catching your train. Bob's got to go to town tonight,' he added, turning to me. The voice rang now as false as hell. I looked at the clock, and it was nearly half-past ten.

'I am afraid he must put off his journey,' I said.

'Oh, damn,' said the young man. 'I thought you had dropped that rot. I've simply got to go. You can have my address, and I'll give any security you like.'

'No,' I said, 'you must stay.'

At that I think they must have realized that the game was desperate. Their only chance had been to convince me that I was playing the fool, and that had failed. But the old man spoke again.

'I'll go bail for my nephew. That ought to content you, Mr Hannay.' Was it fancy, or did I detect some halt in the smoothness of that voice?

There must have been, for as I glanced at him, his eyelids fell in that hawk-like hood which fear had stamped on my memory.

I blew my whistle.

In an instant the lights were out. A pair of strong arms gripped me round the waist, covering the pockets in which a man might be expected to carry a pistol.

'SCHNELL, FRANZ,' cried a voice, 'DAS BOOT, DAS BOOT!' As it spoke I saw two of my fellows emerge on the moonlit lawn.

The young dark man leapt for the window, was through it, and over the low fence before a hand could touch him. I grappled the old chap, and the room seemed to fill with figures. I saw the plump one collared, but my eyes were all for the out-of-doors, where Franz sped on over the road towards the railed entrance to the beach stairs. One man followed him, but he had no chance. The gate of the stairs locked behind the fugitive, and I stood staring, with my hands on the old boy's throat, for such a time as a man might take to descend those steps to the sea.

Suddenly my prisoner broke from me and flung himself on the wall. There was a click as if a lever had been pulled. Then came a low rumbling far, far below the ground, and through the window I saw a cloud of chalky dust pouring out of the shaft of the stairway.

Someone switched on the light.

The old man was looking at me with blazing eyes.

'He is safe,' he cried. 'You cannot follow in time ... He is gone ... He has triumphed ... DER SCHWARZE STEIN IST IN DER SIEGESKRONE.'

There was more in those eyes than any common triumph. They had been hooded like a bird of prey, and now they flamed with a hawk's pride. A white fanatic heat burned in them, and I realized for the first time the terrible thing I had been up against. This man was more than a spy; in his foul way he had been a patriot.

As the handcuffs clinked on his wrists I said my last word to him.

'I hope Franz will bear his triumph well. I ought to tell you that the ARIADNE for the last hour has been in our hands.'

Three weeks later, as all the world knows, we went to war. I joined the New Army the first week, and owing to my Matabele experience got a captain's commission straight off. But I had done my best service, I think, before I put on khaki.

THE END