“The tea which had been ordered was brought up at the end of ten minutes; but the maid, as she approached the door, was surprised to hear the voices of her master and mistress in furious altercation. She knocked without receiving any answer, and even turned the handle, but only to find that the door was locked upon the inside. Naturally enough she ran down to tell the cook, and the two women with the coachman came up into the hall and listened to the dispute which was still raging. They all agreed that only two voices were to be heard, those of Barclay and of his wife. Barclay’s remarks were subdued and abrupt, so that none of them were audible to the listeners. The lady’s, on the other hand, were most bitter, and when she raised her voice could be plainly heard. ‘You coward!’ she repeated over and over again. ‘What can be done now? What can be done now? Give me back my life. I will never so much as breathe the same air with you again! You coward! You coward!’ Those were scraps of her conversation, ending in a sudden dreadful cry in the man’s voice, with a crash, and a piercing scream from the woman. Convinced that some tragedy had occurred, the coachman rushed to the door and strove to force it, while scream after scream issued from within. He was unable, however, to make his way in, and the maids were too distracted with fear to be of any assistance to him. A sudden thought struck him, however, and he ran through the hall door and round to the lawn upon which the long French windows open. One side of the window was open, which I understand was quite usual in the summer-time, and he passed without difficulty into the room. His mistress had ceased to scream and was stretched insensible upon a couch, while with his feet tilted over the side of an arm-chair, and his head upon the ground near the corner of the fender, was lying the unfortunate soldier stone dead in a pool of his own blood.

“Naturally, the coachman’s first thought, on finding that he could do nothing for his master, was to open the door. But here an unexpected and singular difficulty presented itself. The key was not in the inner side of the door, nor could he find it anywhere in the room. He went out again, therefore, through the window, and having obtained the help of a policeman and of a medical man, he returned. The lady, against whom naturally the strongest suspicion rested, was removed to her room, still in a state of insensibility. The Colonel’s body was then placed upon the sofa, and a careful examination made of the scene of the tragedy.

“The injury from which the unfortunate veteran was suffering was found to be a jagged cut some two inches long at the back part of his head, which had evidently been caused by a violent blow from a blunt weapon. Nor was it difficult to guess what that weapon may have been. Upon the floor, close to the body, was lying a singular club of hard carved wood with a bone handle. The Colonel possessed a varied collection of weapons brought from the different countries in which he had fought, and it is conjectured by the police that his club was among his trophies. The servants deny having seen it before, but among the numerous curiosities in the house it is possible that it may have been overlooked. Nothing else of importance was discovered in the room by the police, save the inexplicable fact that neither upon Mrs. Barclay’s person nor upon that of the victim nor in any part of the room was the missing key to be found. The door had eventually to be opened by a locksmith from Aldershot.

“That was the state of things, Watson, when upon the Tuesday morning I, at the request of Major Murphy, went down to Aldershot to supplement the efforts of the police. I think that you will acknowledge that the problem was already one of interest, but my observations soon made me realize that it was in truth much more extraordinary than would at first sight appear.

“Before examining the room I cross-questioned the servants, but only succeeded in eliciting the facts which I have already stated. One other detail of interest was remembered by Jane Stewart, the housemaid. You will remember that on hearing the sound of the quarrel she descended and returned with the other servants. On that first occasion, when she was alone, she says that the voices of her master and mistress were sunk so low that she could hear hardly anything, and judged by their tones rather than their words that they had fallen out. On my pressing her, however, she remembered that she heard the word David uttered twice by the lady. The point is of the utmost importance as guiding us towards the reason of the sudden quarrel. The Colonel’s name, you remember, was James.

“There was one thing in the case which had made the deepest impression both upon the servants and the police. This was the contortion of the Colonel’s face. It had set, according to their account, into the most dreadful expression of fear and horror which a human countenance is capable of assuming. More than one person fainted at the mere sight of him, so terrible was the effect. It was quite certain that he had foreseen his fate, and that it had caused him the utmost horror. This, of course, fitted in well enough with the police theory, if the Colonel could have seen his wife making a murderous attack upon him. Nor was the fact of the wound being on the back of his head a fatal objection to this, as he might have turned to avoid the blow. No information could be got from the lady herself, who was temporarily insane from an acute attack of brain-fever.

“From the police I learned that Miss Morrison, who you remember went out that evening with Mrs. Barclay, denied having any knowledge of what it was which had caused the ill-humor in which her companion had returned.

“Having gathered these facts, Watson, I smoked several pipes over them, trying to separate those which were crucial from others which were merely incidental. There could be no question that the most distinctive and suggestive point in the case was the singular disappearance of the door-key. A most careful search had failed to discover it in the room. Therefore it must have been taken from it. But neither the Colonel nor the Colonel’s wife could have taken it. That was perfectly clear. Therefore a third person must have entered the room. And that third person could only have come in through the window. It seemed to me that a careful examination of the room and the lawn might possibly reveal some traces of this mysterious individual. You know my methods, Watson. There was not one of them which I did not apply to the inquiry. And it ended by my discovering traces, but very different ones from those which I had expected. There had been a man in the room, and he had crossed the lawn coming from the road. I was able to obtain five very clear impressions of his foot-marks: one in the roadway itself, at the point where he had climbed the low wall, two on the lawn, and two very faint ones upon the stained boards near the window where he had entered. He had apparently rushed across the lawn, for his toe-marks were much deeper than his heels. But it was not the man who surprised me. It was his companion.”

“His companion!”

Holmes pulled a large sheet of tissue-paper out of his pocket and carefully unfolded it upon his knee.

“What do you make of that?” he asked.

The paper was covered with the tracings of the foot-marks of some small animal. It had five well-marked foot-pads, an indication of long nails, and the whole print might be nearly as large as a dessert-spoon.

“It’s a dog,” said I.

“Did you ever hear of a dog running up a curtain? I found distinct traces that this creature had done so.”

“A monkey, then?”

“But it is not the print of a monkey.”

“What can it be, then?”

“Neither dog nor cat nor monkey nor any creature that we are familiar with. I have tried to reconstruct it from the measurements. Here are four prints where the beast has been standing motionless. You see that it is no less than fifteen inches from fore-foot to hind. Add to that the length of neck and head, and you get a creature not much less than two feet long—probably more if there is any tail. But now observe this other measurement. The animal has been moving, and we have the length of its stride. In each case it is only about three inches. You have an indication, you see, of a long body with very short legs attached to it. It has not been considerate enough to leave any of its hair behind it. But its general shape must be what I have indicated, and it can run up a curtain, and it is carnivorous.”

“How do you deduce that?”

“Because it ran up the curtain. A canary’s cage was hanging in the window, and its aim seems to have been to get at the bird.”

“Then what was the beast?”

“Ah, if I could give it a name it might go a long way towards solving the case. On the whole, it was probably some creature of the weasel and stoat tribe—and yet it is larger than any of these that I have seen.”

“But what had it to do with the crime?”

“That, also, is still obscure. But we have learned a good deal, you perceive. We know that a man stood in the road looking at the quarrel between the Barclays—the blinds were up and the room lighted. We know, also, that he ran across the lawn, entered the room, accompanied by a strange animal, and that he either struck the Colonel or, as is equally possible, that the Colonel fell down from sheer fright at the sight of him, and cut his head on the corner of the fender. Finally, we have the curious fact that the intruder carried away the key with him when he left.”

“Your discoveries seem to have left the business more obscure that it was before,” said I.

“Quite so. They undoubtedly showed that the affair was much deeper than was at first conjectured. I thought the matter over, and I came to the conclusion that I must approach the case from another aspect. But really, Watson, I am keeping you up, and I might just as well tell you all this on our way to Aldershot to-morrow.”

“Thank you, you have gone rather too far to stop.”

“It is quite certain that when Mrs. Barclay left the house at half-past seven she was on good terms with her husband. She was never, as I think I have said, ostentatiously affectionate, but she was heard by the coachman chatting with the Colonel in a friendly fashion. Now, it was equally certain that, immediately on her return, she had gone to the room in which she was least likely to see her husband, had flown to tea as an agitated woman will, and finally, on his coming in to her, had broken into violent recriminations. Therefore something had occurred between seven-thirty and nine o’clock which had completely altered her feelings towards him. But Miss Morrison had been with her during the whole of that hour and a half. It was absolutely certain, therefore, in spite of her denial, that she must know something of the matter.

“My first conjecture was, that possibly there had been some passages between this young lady and the old soldier, which the former had now confessed to the wife. That would account for the angry return, and also for the girl’s denial that anything had occurred. Nor would it be entirely incompatible with most of the words overhead. But there was the reference to David, and there was the known affection of the Colonel for his wife, to weigh against it, to say nothing of the tragic intrusion of this other man, which might, of course, be entirely disconnected with what had gone before. It was not easy to pick one’s steps, but, on the whole, I was inclined to dismiss the idea that there had been anything between the Colonel and Miss Morrison, but more than ever convinced that the young lady held the clue as to what it was which had turned Mrs. Barclay to hatred of her husband. I took the obvious course, therefore, of calling upon Miss M., of explaining to her that I was perfectly certain that she held the facts in her possession, and of assuring her that her friend, Mrs. Barclay, might find herself in the dock upon a capital charge unless the matter were cleared up.

“Miss Morrison is a little ethereal slip of a girl, with timid eyes and blond hair, but I found her by no means wanting in shrewdness and common-sense. She sat thinking for some time after I had spoken, and then, turning to me with a brisk air of resolution, she broke into a remarkable statement which I will condense for your benefit.

“‘I promised my friend that I would say nothing of the matter, and a promise is a promise,’ said she; ‘but if I can really help her when so serious a charge is laid against her, and when her own mouth, poor darling, is closed by illness, then I think I am absolved from my promise. I will tell you exactly what happened upon Monday evening.

“‘We were returning from the Watt Street Mission about a quarter to nine o’clock. On our way we had to pass through Hudson Street, which is a very quiet thoroughfare. There is only one lamp in it, upon the left-hand side, and as we approached this lamp I saw a man coming towards us with his back very bent, and something like a box slung over one of his shoulders. He appeared to be deformed, for he carried his head low and walked with his knees bent. We were passing him when he raised his face to look at us in the circle of light thrown by the lamp, and as he did so he stopped and screamed out in a dreadful voice, “My God, it’s Nancy!” Mrs. Barclay turned as white as death, and would have fallen down had the dreadful-looking creature not caught hold of her. I was going to call for the police, but she, to my surprise, spoke quite civilly to the fellow.

“‘”I thought you had been dead this thirty years, Henry,” said she, in a shaking voice.

“‘”So I have,” said he, and it was awful to hear the tones that he said it in. He had a very dark, fearsome face, and a gleam in his eyes that comes back to me in my dreams. His hair and whiskers were shot with gray, and his face was all crinkled and puckered like a withered apple.

“‘”Just walk on a little way, dear,” said Mrs. Barclay; “I want to have a word with this man. There is nothing to be afraid of.” She tried to speak boldly, but she was still deadly pale and could hardly get her words out for the trembling of her lips.

“‘I did as she asked me, and they talked together for a few minutes. Then she came down the street with her eyes blazing, and I saw the crippled wretch standing by the lamp-post and shaking his clenched fists in the air as if he were mad with rage. She never said a word until we were at the door here, when she took me by the hand and begged me to tell no one what had happened.

“‘”It’s an old acquaintance of mine who has come down in the world,” said she. When I promised her I would say nothing she kissed me, and I have never seen her since. I have told you now the whole truth, and if I withheld it from the police it is because I did not realize then the danger in which my dear friend stood. I know that it can only be to her advantage that everything should be known.’