"I can conceive of no explanation."
"And yet there should be no combination of events for which the wit of man cannot conceive an explanation. Simply as a mental exercise, without any assertion that it is true, let me indicate a possible line of thought. It is, I admit, mere imagination; but how often is imagination the mother of truth?
"We will suppose that there was a guilty secret, a really shameful secret in the life of this man Douglas. This leads to his murder by someone who is, we will suppose, an avenger, someone from outside. This avenger, for some reason which I confess I am still at a loss to explain, took the dead man's wedding ring. The vendetta might conceivably date back to the man's first marriage, and the ring be taken for some such reason.
"Before this avenger got away, Barker and the wife had reached the room. The assassin convinced them that any attempt to arrest him would lead to the publication of some hideous scandal. They were converted to this idea, and preferred to let him go. For this purpose they probably lowered the bridge, which can be done quite noiselessly, and then raised it again. He made his escape, and for some reason thought that he could do so more safely on foot than on the bicycle. He therefore left his machine where it would not be discovered until he had got safely away. So far we are within the bounds of possibility, are we not?"
"Well, it is possible, no doubt," said I, with some reserve.
"We have to remember, Watson, that whatever occurred is certainly something very extraordinary. Well, now, to continue our supposititious case, the couple—not necessarily a guilty couple—realize after the murderer is gone that they have placed themselves in a position in which it may be difficult for them to prove that they did not themselves either do the deed or connive at it. They rapidly and rather clumsily met the situation. The mark was put by Barker's bloodstained slipper upon the window-sill to suggest how the fugitive got away. They obviously were the two who must have heard the sound of the gun; so they gave the alarm exactly as they would have done, but a good half hour after the event."
"And how do you propose to prove all this?"
"Well, if there were an outsider, he may be traced and taken. That would be the most effective of all proofs. But if not—well, the resources of science are far from being exhausted. I think that an evening alone in that study would help me much."
"An evening alone!"
"I propose to go up there presently. I have arranged it with the estimable Ames, who is by no means whole-hearted about Barker. I shall sit in that room and see if its atmosphere brings me inspiration. I'm a believer in the genius loci. You smile, Friend Watson. Well, we shall see. By the way, you have that big umbrella of yours, have you not?"
"It is here."
"Well, I'll borrow that if I may."
"Certainly—but what a wretched weapon! If there is danger—"
"Nothing serious, my dear Watson, or I should certainly ask for your assistance. But I'll take the umbrella. At present I am only awaiting the return of our colleagues from Tunbridge Wells, where they are at present engaged in trying for a likely owner to the bicycle."
It was nightfall before Inspector MacDonald and White Mason came back from their expedition, and they arrived exultant, reporting a great advance in our investigation.
"Man, I'll admeet that I had my doubts if there was ever an outsider," said MacDonald, "but that's all past now. We've had the bicycle identified, and we have a description of our man; so that's a long step on our journey."
"It sounds to me like the beginning of the end," said Holmes. "I'm sure I congratulate you both with all my heart."
"Well, I started from the fact that Mr. Douglas had seemed disturbed since the day before, when he had been at Tunbridge Wells. It was at Tunbridge Wells then that he had become conscious of some danger. It was clear, therefore, that if a man had come over with a bicycle it was from Tunbridge Wells that he might be expected to have come. We took the bicycle over with us and showed it at the hotels. It was identified at once by the manager of the Eagle Commercial as belonging to a man named Hargrave, who had taken a room there two days before. This bicycle and a small valise were his whole belongings. He had registered his name as coming from London, but had given no address. The valise was London made, and the contents were British; but the man himself was undoubtedly an American."
"Well, well," said Holmes gleefully, "you have indeed done some solid work while I have been sitting spinning theories with my friend! It's a lesson in being practical, Mr. Mac."
"Ay, it's just that, Mr. Holmes," said the inspector with satisfaction.
"But this may all fit in with your theories," I remarked.
"That may or may not be. But let us hear the end, Mr. Mac. Was there nothing to identify this man?"
"So little that it was evident that he had carefully guarded himself against identification. There were no papers or letters, and no marking upon the clothes. A cycle map of the county lay on his bedroom table. He had left the hotel after breakfast yesterday morning on his bicycle, and no more was heard of him until our inquiries."
"That's what puzzles me, Mr. Holmes," said White Mason. "If the fellow did not want the hue and cry raised over him, one would imagine that he would have returned and remained at the hotel as an inoffensive tourist. As it is, he must know that he will be reported to the police by the hotel manager and that his disappearance will be connected with the murder."
"So one would imagine. Still, he has been justified of his wisdom up to date, at any rate, since he has not been taken. But his description—what of that?"
MacDonald referred to his notebook. "Here we have it so far as they could give it. They don't seem to have taken any very particular stock of him; but still the porter, the clerk, and the chambermaid are all agreed that this about covers the points. He was a man about five foot nine in height, fifty or so years of age, his hair slightly grizzled, a grayish moustache, a curved nose, and a face which all of them described as fierce and forbidding."
"Well, bar the expression, that might almost be a description of Douglas himself," said Holmes. "He is just over fifty, with grizzled hair and moustache, and about the same height. Did you get anything else?"
"He was dressed in a heavy gray suit with a reefer jacket, and he wore a short yellow overcoat and a soft cap."
"What about the shotgun?"
"It is less than two feet long. It could very well have fitted into his valise. He could have carried it inside his overcoat without difficulty."
"And how do you consider that all this bears upon the general case?"
"Well, Mr. Holmes," said MacDonald, "when we have got our man—and you may be sure that I had his description on the wires within five minutes of hearing it—we shall be better able to judge. But, even as it stands, we have surely gone a long way. We know that an American calling himself Hargrave came to Tunbridge Wells two days ago with bicycle and valise. In the latter was a sawed-off shotgun; so he came with the deliberate purpose of crime. Yesterday morning he set off for this place on his bicycle, with his gun concealed in his overcoat. No one saw him arrive, so far as we can learn; but he need not pass through the village to reach the park gates, and there are many cyclists upon the road. Presumably he at once concealed his cycle among the laurels where it was found, and possibly lurked there himself, with his eye on the house, waiting for Mr. Douglas to come out. The shotgun is a strange weapon to use inside a house; but he had intended to use it outside, and there it has very obvious advantages, as it would be impossible to miss with it, and the sound of shots is so common in an English sporting neighbourhood that no particular notice would be taken."
"That is all very clear," said Holmes.
"Well, Mr. Douglas did not appear. What was he to do next? He left his bicycle and approached the house in the twilight. He found the bridge down and no one