"The next thing I remember, was finding myself lying on the floor, and, when I tried to get up, seeing everything in the room swinging about me like the swinging boats at a fair. I don't know how long I had been unconscious, but when, at last, I managed to stand up, and clinging, faint and giddy, to the back of a chair, looked again at the motionless figure that sprawled across the writing-table, there was a great pool of blood on the polished oak of the floor beneath it, which grew slowly broader, as drop after drop dripped down to swell it. With a great effort I conquered my faintness, and staggered out of the room and down the long passage.

"In the billiard-room Mr. McConachan was still practising his game. He must have been making a break, for I remember hearing him speak, as I opened the door. 'Twenty-seven,' he said aloud. My voice wouldn't come, and I stood holding on to the doorpost, while he, with his back to me, went on potting the red.

"'That you, Miss Byrne?' he said, without looking round. Then, as I didn't answer, he glanced up and saw by my face, I suppose, that something was very wrong. He came quickly to me, his cue in his hand. 'What's the matter?' he said. 'Do you feel ill?' 'Lord Ashiel is dead,' I said; 'in the library. Some one shot him. Didn't you hear?' 'Dead?' he cried; 'Uncle Douglas shot! Do you know what you're saying! I heard a shot, it is true, five minutes ago, but surely that was the keeper shooting an owl or something.'

"I shook my head. 'He is dead,' I repeated dully. He looked at me, still incredulous, and then darted forward and caught me by the arm. 'Here, sit down,' he said, and half pushed, half led me to a chair. I saw him run to the bell and tug violently at the rope. Then I believe I fainted again.

"I think that is all there is to tell you, Mr. Gimblet. You know already that the murderer got clear away, and the next morning footmarks were found outside the window which proved to have been made by Sir David Southern. I was so idiotic, when I was questioned, as to mention having spoken to him outside the gun-room door, and to repeat, incidentally, that he had said he had been cleaning his rifle. I never dreamt that anyone could be so mad as to suspect him. But they looked at the rifle, and found that it was dirty, so that it must have been discharged again since I saw him. And it appears he did not join in the search for the murderer, and was not seen until it was all over. And so they arrested him and took him away. No amount of evidence could ever make me believe for a moment that he had a hand in this dreadful thing, but oh, Mr. Gimblet, I see only too well how black it looks against him. What shall I do if you, too, now that I have told you everything, think he did it? You don't, do you?"

"My dear young lady," said the detective. "I really can't give you an opinion at present. There are a score of points I must investigate, a dozen other people besides yourself whom I must question, before I can form any kind of conclusion. I hope that Sir David Southern may prove to be a much wronged man. But beyond that I can't go, just at present; and I shouldn't build too much on my help if I were you. I'm not infallible; far from it. And I certainly can't prove him innocent if he is guilty."

He stood up, shaking the sand out of his clothes.

"Let us go on, up to the castle," he said.

The gates were near at hand; in silence they breasted the steep incline of the drive, which wound and zigzagged up between high banks covered with rhododendron and bracken, and grown over with trees. After a quarter of a mile these gave place to an abrupt, grass covered slope, whose top had been smoothed and levelled by the hand of man, and from which on the far side rose the castle of Inverashiel, its stout and ancient framework disguised and masked by the modern addition to the building which faced the approach; a mass of gabled and turreted stonework in the worst style of nineteenth century architecture which in Scotland often took on a shape and semblance even more fantastically repulsive than it assumed in the south. The great tower that formed the principal remaining portion of the old building could just be discerned over the top of the flaring faÇade, but the nature of the site was such that most of the ancient fortress was invisible from that part of the grounds. Juliet stopped at the turn of the road.

"I will leave you here," she said, "you will not want me, I suppose? After you have finished, will you come to Lady Ruth Worsfold's house, and tell me what you think? It is just past the station turning; you will easily find your way, though the house is hidden by the trees. Your luggage will be there already, as Lady Ruth is going to put you up."

Mr. Mark McConachan, or rather Lord Ashiel, as he had now become, was in the act of ending a solitary meal, when Gimblet was announced. He went to meet the detective, forcing to his trouble-lined face a smile of welcome that lit up the large melancholy eyes with an expression few people could resist.

"I thought it was another of those newspaper fellows, but, thank goodness, I believe they're all gone now," he said. "I am exceedingly glad to see you, Mr. Gimblet. I should myself have asked you to come to our aid, but I found that Miss Byrne had been before me. I suppose you have seen her?"

"Yes," said Gimblet. "She met me at the station. I'm afraid I'm rather late on the scene. I hear that the Glasgow police have come and gone, taking with them the author of the crime."

"It is a dreadful business altogether," returned young Ashiel. "I don't know which part of it is the worst. There's my uncle dead, shot down like a rat by some cold-blooded scoundrel; and now my cousin David, poor chap, in jail, and under charge of murder. It seems impossible to believe it of him, and yet, what is one to believe? One can only suppose that he must have been off his head if he did it. But have you had lunch, Mr. Gimblet? Sit down and have something to eat first of all; you can ask me any questions you wish while you are eating."

And he insisted on Gimblet's doing as he suggested.

"The household is naturally a bit disorganized," he said when the servants had left the room and the detective was busy with some cold grouse. "I had a cold lunch myself to save trouble; would you rather have something hot? I expect that a chop or something could be produced, if you are cold after your journey."

Gimblet assured him that he could like nothing better than what he already had.

"You have had Macross up here, haven't you?" he asked. "It is really disappointing to find the whole thing over before I arrive. I am afraid there is nothing left for me to do."

Mark looked at him quickly. Was it possible he accepted Macross's verdict without inquiring further himself?

"We are hoping you will undo what has been done," he said. "I look to you to get my cousin out of prison. Surely there must be some other explanation than that he did it. I simply won't believe it."

"If there is any other explanation," said Gimblet, "I will try and find it; but the affair looks bad against Sir David Southern from what I can hear."

"Why should he have shot through the window?" said Ashiel. "They were both in the same house. Why should my cousin go into the garden, when he had nothing to do but to open the library door and shoot, if he wanted to?"

"Oh," said Gimblet, "ordinary caution would suggest the garden. He did not know perhaps, whether his uncle would be alone; and as a matter of fact, he was not, was he?"

"No, Miss Byrne was with him. By Jove," said Mark, bending forward to light a cigarette, "I shall never forget the fright it gave me when I saw her face. She looked as if—oh, she looked perfectly ghastly! I was in the billiard-room when she came in, as white as a sheet, and stood there without speaking for a minute, while I imagined every sort of catastrophe except the real one. And all the time I kept thinking it would turn out to be nothing really, as likely as not; women will look hideously frightened and upset if they cut their finger, or see a rat, or think they hear burglars. One never knows. And then at last she got out a few words, 'Lord Ashiel has been shot,' or something of the sort, and fainted."

"What did you do?" asked Gimblet.

"Well, I had to see to her, you know. I couldn't very well leave her in that state, could I? I hung on to the bell for all I was worth, and the butler and footmen came running. I told them to look after the young lady and to call her maid, and then I ran off to the library, followed by old Blanston, the butler. You know what we found there. My poor old uncle, dead as a door nail; a hole in the window where the bullet came in, and the floor around him all covered with blood. Ugh!" Mark shuddered, "it was horrid. We only stayed to make sure he was dead, and then we left him as we had found him and rushed back to rouse the rest of the household, and to start a chase after the murderer. Of course the first person I looked for was David Southern, but he wasn't to be found, so I and three menservants ran out at once with sticks and lanterns, and hunted all over the grounds without seeing or hearing anything or anyone. The hall boy had been sent down to fetch up the stablemen and chauffeur, and to rout out some of the gardeners and anyone else he could find, so that we were a decently large party, and I don't think there was an inch of ground we didn't go over, of all that lies within the policies. The murderer, however, had plenty of time to get right away, and as it was hopeless to scour the whole country side in that darkness—for it was as black as your hat—I decided, after an hour of groping about in the shrubberies, that we must leave off and wait for daylight."

"What time was it when you abandoned the hunt?" asked Gimblet.

"It was past midnight. I didn't see that any good could be done by sitting up all night. On the contrary, I thought it important that we should get some sleep while we could, so as to be fresher for the chase when daylight came. At this time of the year it gets light fairly early, so I sent every one to bed, except two of the ghillies, whom I told to row across the loch to Crianan and fetch the doctor and police, which I suppose I ought to have thought of before. Then I went to bed myself."

"And when did Sir David Southern turn up?" asked Gimblet.

"Oh, he appeared soon after we started to beat the policies. I hadn't time then to ask him where he'd been, and he was as keen on catching the murderer as anyone. Of course it never occurred to me to cross-question him."

"Naturally. Please go on with your narrative."

"Well, we slept, to speak for myself, for three or four hours, and then James and Andrew came back with the people I had sent for. And now, Mr. Gimblet, I come to a strange thing, a thing I've been careful not to mention to anyone but you, though I'm afraid it's bound to come out at the trial. When Blanston and I went out of the library, we locked the door behind us, but when I opened it again, to let in the doctor and the police, my uncle's body had been moved."

"Moved? How?" Gimblet repeated after him.

"Oh, not far, but it had been touched by some one, I am ready to swear, though I said nothing about it at the time. When we first found him, he was lying forward on the table with one arm under his head and the other hanging beside him. When I went in for the second time he was sitting sideways in his chair with his head and arm in quite a different place. Instead of being in the middle, on the blotting-pad, they were further to the right, on the bare polished wood."

Gimblet looked at him keenly.

"You are perfectly certain of this?" he said.

"Absolutely. Besides, you can ask Miss Byrne and Blanston. They both saw him as he was at first. And the police and Dr. Duncan can tell you what his position was when they went into the room. I said nothing about it to any of them, because I thought at once that it must be David who had been there."

"Why did you think that?"

"Because he knew where the key was. I took it out of my pocket when we were alone in the smoking-room before going up to bed, and asked him what I should do with it.

"'Oh, put it in a drawer,' he said, pointing to the writing-table, and I put it there, as he suggested. Of course I see now that some one else may have found the key in that drawer, but at first it did look as if David must, for some reason, have taken it, and been in the library, after I'd gone to bed."

"It seems very unlikely that anyone else would have hit on the place where you had put it," said Gimblet reflectively. "And if they had done so, would they have recognized the key? Is the library key peculiar in any way?"

"It is rather an uncommon pattern," said Mark. "It is very old and strong. I think anyone who knew the key would have recognized it all right."

"It is hardly likely that anyone would have found it if they had had to search all through the house for it in the middle of the night," commented Gimblet. "Is there no other way of getting into the library?"

"No, there is only one door."

"How about the window? It was broken; could not anyone have put in a hand, or raised the sash?"

"I don't think anyone could have got in. It isn't a sash window. There are stone mullions and small leaded casements in the old part of the castle where the library is, and I doubt if anyone larger than a child could squeeze through; in fact, a child couldn't; there are iron bars down the middle, which make it too narrow."

"H'm," murmured Gimblet. "I should like to have a look at them. And what was the doctor's report?"

"He said that the injuries to the heart were such that death must have been instantaneous, or practically so."

"Did anything else come out?"

"Nothing, except the evidence against poor old David, I'm sorry to say."

"You haven't told me that yet," said Gimblet. "Go on from when the police arrived on the scene."

"As soon as it was daylight we started off again on our search. But right at the beginning of it, they came upon the footsteps."

"Ah, where were they?"

"The flower-bed outside the library window showed them plainly; the ground beyond that was mossy, and there were no other marks. We divided into two parties, one going west down the side of the loch, and the other north and east over the hills. Till ten o'clock or later we beat the country, searching behind every rock, and going through the woods and bracken in a close line. But we saw no sign of a stranger, and came back at last, dead beat, for food and a rest. When we got back we found that the policeman left in charge had been nosing about, and whiling away his time by collecting the boots of every one in the house and fitting them to the footprints on the flower-bed. As bad luck would have it, David's shooting-boots exactly fitted the marks."

"His shooting-boots?" said Gimblet. "He wouldn't be wearing shooting-boots after dinner."

"That's what he said himself, and there seems no imaginable reason why he should have worn them, unless—" Mark hesitated for a moment, and then went on in a tone perhaps rather too positive to carry complete conviction to a critical ear. "Of course not. He can't have put them on after dinner. The idea is ludicrous. He must have made those footmarks earlier in the day."

"Is that what he himself says?" asked the detective. He had finished eating, and was leaning back in his chair with that air of far-off contemplation which those best acquainted with him knew was habitually his expression when his attention and interest were more than usually roused.

"No," admitted Mark regretfully. "He doesn't. He sticks to it that he'd never been near the flower-bed, with boots, or without them; it's my belief his memory has been affected by the shock of all this. And he would insist on talking to the police, though they warned him that what he said might be used against him. I did all I could to stop him, but it was no good. It really looked as if he was doing his best to incriminate himself."

"How was that? What else did he say?"

"You see," said Mark, "when the Crianan man had got hold of the boots that matched the footprints, he was no end excited by his success. Pleased to death with himself, he was. And he was as keen as mustard on following up his rotten clue. The next thing he did was to want a look at David's guns. Of course we didn't make any objection to that, though if I'd known—well, it's no earthly thinking of that now. So off we all marched in procession to the gun-room, and it didn't take long to see that the only one of the whole lot there that hadn't been cleaned since it was last fired was the Mannlicher David had shot his stag with the day before. The silly ass of a constable took it up and squinted through it as solemn as a judge, and then he just handed it to my cousin, and 'What have you to say to this, Sir David?' says he. Infernal cheek! 'I shot it off yesterday, and haven't had time to clean it since,' said David, and I, for one, could have sworn he was speaking the truth. Why not, indeed? There was nothing improbable about it. But the dickens of the thing was that while we were all out of the house, and he had the place to himself, the policeman had routed out poor Miss Byrne and badgered her for an account of all that had happened the evening before; and she, without a thought of doing harm to any of us—I'm convinced she's as sorry for it now as I am myself—had mentioned incidentally that David had told her, when she saw him half an hour before the murder, that he'd just been cleaning his rifle. She'd told me so, too, as far as that goes, when she passed through the billiard-room on her way to the library. I happened to ask her if she knew what he was up to."

"Decidedly awkward for Sir David," said Gimblet meditatively, "but after all, some one else might have fired off the rifle after he had cleaned it."

Mark shook his head gloomily.

"There are difficulties about that," he said. "It happens that David is very fussy about his guns, always cleans them himself, you know, and won't let another soul touch 'em. And though he keeps them in the gunroom like the rest of us, he's got his own particular glass-fronted cupboard which he keeps the key of himself. My uncle and I share one between us, and generally leave the key in the lock, so that the keeper can get at the guns, which we never bother to clean ourselves. Not so David. Ever since we were boys he's had his own private cupboard, and no one but himself has ever been allowed to open it. We always spent our holidays here, and my uncle let us behave as if we were at our own house. David took out the key for the sergeant to use, and when he was asked if anyone else could have got at the rifle, he replied that it was impossible, as the key had been in his pocket the whole time, except for an hour or two while he was asleep, when it had lain on the table by his bedside."

"Did he deny having told Miss Byrne he had cleaned the rifle?" asked Gimblet.

"Yes; he said he hadn't told her so. It was all very unpleasant, and the police sergeant was as suspicious as you like, by this time. 'What were you doing when the alarm was given?' he asked David. 'I was out in the grounds,' said David, and that was rather a facer for the rest of us, I must confess. He went on to say that he had fancied he saw some one hanging about at the edge of the lawn—which is the opposite side of the house from the library—and gone out to make sure, but he had found no one, though he hunted about for nearly an hour, till he saw lights approaching and fell in with our party of searchers. He said that it was then he first heard what had happened."

Gimblet nodded his head thoughtfully.

"Miss Byrne said she saw him start off to look for some one," he remarked.

"Yes," said Mark eagerly, "there's no doubt he saw a man lurking in the darkness. And it was dark too," he added, "never saw such a black night in my life; I must say it beats me how he could have seen anyone. But his eyes were always rather more useful than mine," he concluded hastily.

"The police, however, seem to have thought it improbable," said Gimblet, "since they arrested your cousin for the murder."

"Stupid brutes!" said Mark viciously. "No, they would have it it was impossible he should have seen anyone. And what clinched it was the unlucky fact that David and my uncle had had a violent row the day before. My uncle shot David's dog; I must say I think it was uncalled for, and poor David was absurdly fond of the beast. He felt very savage about it, and all the ghillies heard what he said to Uncle Douglas."

"What did he say?"

"Oh, a lot of rot. He lost his temper. The idiotic thing he said was, that he'd a good mind to shoot him and see how he liked it. Pure temper, you know. I don't believe David would hurt a hair of his head."

"Well, it was decidedly an indiscreet remark."

"It was imbecile. And of course the police heard all about it from the servants and keepers, and it fitted in only too well with all the rest about the footmarks and his absence from the house at the time, and the rifle and everything. By the by, the bullet was a soft-nosed one which fitted David's rifle; but for that matter it fitted mine—which is a .355 Mannlicher like his—or a dozen others on the loch side. It's a very common weapon on a Scotch forest. But taking one thing with another there was a good deal of evidence against him, so they made up their minds he had done it; and Macross, when he arrived from Glasgow with his myrmidons, agreed with the local idiots, and took him off. I'm certain there must be a mistake somewhere, but so far it seems jolly hard to hit on it. I hope you'll put your finger on the spot."

"I hope so," said Gimblet, but his voice was full of doubt. "It's hard to see how anyone else could have used his rifle after he cleaned it, since he admits that he locked it up and kept the key on him. Yes," he murmured to himself, "the rifle speaks very eloquently. What other interpretation can be put on these facts? I'm sure you must see that yourself," he went on, glancing up at Mark, who was feeling in his pocket for another cigarette. "Sir David told Miss Byrne he had cleaned his rifle; he told the police he then locked it up and that the key had been in his possession ever since. But the rifle was found to have been fired again since he had cleaned it. His only explanation was to contradict what he had previously said to Miss Byrne. Do those facts appear to you to leave any possible loophole of doubt as to his guilt?"

Mark struck a match and lighted his cigarette before he answered. When at length he did so his reluctance was very plain, and his voice full of regret.

"Poor old chap," he said. "I'm afraid he must have done it in some fit of madness. As you say, there is no other imaginable alternative."

Gimblet nodded philosophically.

"Is there anything else?" he asked.

Mark hesitated.

"There's a letter which arrived for Uncle Douglas this morning," he said, "which you may think worth looking at. I daresay it's of no importance, but it struck me as rather odd."

He took a letter out of his pocket and handed it to the detective, who opened it and read as follows:

"Si Milord ne rend pas ce qu'il ne doit pas garder, le coup de foudre lui tombera sur la tÊte."

There was no signature, nor any date.

Gimblet turned the sheet over thoughtfully. The message was typewritten on a piece of thin foreign paper; the postmark on the envelope was Paris, and the stamps French. He folded it again and replaced it in its cover.

"It seems the usual threatening anonymous communication," he observed.
"Have you any idea who it's from?"

Mark shook his head.

"None," he confessed. "It looks, though, as if my uncle had in his possession something belonging to the writer, doesn't it? Don't you think it might have something to do with the murder?"

"I don't see why the murderer should send a threatening letter after the deed was done," said the detective. "Still less could he have posted it in Paris on the very day the crime was committed."

"No, that's true enough," Mark admitted reluctantly.

"Has any suspicious looking person been seen about this place, this summer? Any foreigner, for instance?" asked the detective.

"No; no," Mark replied. "I should have heard of it for certain if there had been. It would have been an event, down here."

Gimblet dropped the subject.

"If I may," he said. "I will keep this. It may lead to something," he added, tucking the letter away in an inside pocket. "That's all, I suppose?"

Mark was silent for a minute. He seemed to be thinking.

"That's all I know about the murder," he said at last, "but there are plenty of complications apart from that. I suppose Miss Byrne told you that my uncle electrified us all by saying she was his daughter, only an hour or so before he died?"

Gimblet nodded. "Yes," he said, "she told me."

"It makes it very awkward for me," said Mark. "I want to do the right thing, but I'm hanged if I know what I ought to do. You see, my uncle used to say that he'd left his property between me and David; he never made any secret of it, and as a matter of fact I've had a communication from his London lawyers, telling me they have a very old will, made when I was a small boy, long before the birth of his son, and that everything is left to me. There were reasons why he may have thought David would be provided for—he was engaged to marry a very rich American, but she dropped him yesterday like a red-hot coal as soon as it began to look as if he'd be suspected. She's gone now, I'm glad to say. As a matter of fact, if David can only be cleared of this horrible charge, I shall insist on dividing my inheritance with him. That is, if I can't get Miss Byrne to take it, or Miss McConachan, as I ought to call her now."

"Lord Ashiel could leave his money where he liked, couldn't he?"
Gimblet inquired.

"Yes, he could, but he would naturally have left it to his daughter, if she really was his daughter. In fact, Miss McConachan says he told her he had done so, but I haven't come across the will so far, though I had a good hunt through his papers this morning; Blanston and the housekeeper, who say they witnessed some document which may have been a will, have no idea where it is. Of course, my uncle may have intended to say that he was going to make one, and Miss McConachan may have misunderstood him, but she seems to think he had some secret hiding-place of his own, and I hope to goodness you'll be able to hit on it, if he had. I can't stand the idea of profiting by a lost will, and I'd far rather simply hand over the money than bother to look for this missing paper."

"Oh, I daresay it will turn up," said Gimblet. "You haven't had much time to find it yet."

"My uncle was a very methodical man. Everything is in its place. You wait till you see his papers! If he made a will he must have hidden it somewhere where we shall never dream of looking for it. It's just waste of time hunting about, and I shall have another try at persuading my new cousin to let me make over everything to her."

"It is not every young man in your position who would part so readily with a large fortune," observed Gimblet.

But Mark awkwardly deprecated his approving words.

"Oh," he said, "I'm sure any decent chap would do the same in my place."