"I dare say he doesn't think so. He is a wonderful creature, a great artist; but in spite of that he is not at all a sensitive type. It has never occurred to his mind that you, Murch, could suspect him, Martin, the complete, the accomplished. But I know it. You must understand, inspector, that I have made a special study of the psychology of officers of the law. It is a grossly neglected branch of knowledge. They are far more interesting than criminals, and not nearly so easy. All the time I was questioning him I saw handcuffs in your eye. Your lips were mutely framing the syllables of those tremendous words: 'It is my duty to tell you that anything you now say will be taken down and used in evidence against you.' Your manner would have deceived most men, but it could not deceive me."

Mr. Murch laughed heartily. Trent's nonsense never made any sort of impression on his mind, but he took it as a mark of esteem, which indeed it was; so it never failed to please him. "Well, Mr. Trent," he said, "you're perfectly right. There's no point in denying it. I have got my eye on him. Not that there's anything definite; but you know, as well as I do, how often servants are mixed up in affairs of this kind, and this man is such a very quiet customer. You remember the case of Lord William Russell's valet, who went in as usual in the morning to draw up the blinds in his master's bedroom, as quiet and starchy as you please, a few hours after he had murdered him in his bed. I've talked to all the women of the house, and I don't believe there's a morsel of harm in one of them. But Martin's not so easy set aside. I don't like his manner; I believe he's hiding something. If so, I shall find it out."

"Cease!" said Trent. "Drain not to its dregs the urn of bitter prophecy. Let us get back to facts. Have you, as a matter of evidence, anything at all to bring against Martin's story as he has told it to us?"

"Nothing whatever at present. As for his suggestion that Manderson came in by way of the window after leaving Marlowe and the car, that's right enough, I should say. I questioned the servant who swept the room next morning, and she tells me there were gravelly marks near the window, on this plain drugget that goes round the carpet. And there's a footprint in this soft new gravel just outside." The inspector took a folding rule from his pocket and with it pointed out the traces. "One of the patent shoes Manderson was wearing that night exactly fits that print—you'll find them," he added, "on the top shelf in the bedroom, near the window-end, the only patents in the row. The girl who polished them in the morning picked them out for me."

Trent bent down and studied the faint marks keenly. "Good!" he said. "You have covered a lot of ground, Murch, I must say. That was excellent about the whisky—you made your point finely. I felt inclined to shout 'Encore!' It's a thing that I shall have to think over."

"I thought you might have fitted it in already," said Mr. Murch. "Come, Mr. Trent, we're only at the beginning of our inquiries, but what do you say to this for a preliminary theory? There's a plan of burglary—say a couple of men in it and Martin squared. They know where the plate is, and all about the handy little bits of stuff in the drawing-room and elsewhere. They watch the house; see Manderson off to bed; Martin comes to shut the window, and leaves it ajar—accidentally on purpose. They wait till Martin goes to bed at twelve-thirty; then they just walk into the library, and begin to sample the whisky first thing. Now suppose Manderson isn't asleep, and suppose they make a noise opening the window, or however it might be. He hears it; thinks of burglars; gets up very quietly to see if anything's wrong; creeps down on them, perhaps, just as they're getting ready for work. They cut and run; he chases them down to the shed, and collars one; there's a fight; one of them loses his temper and his head, and makes a swinging job of it. Now, Mr. Trent, pick that to pieces."

"Very well," said Trent. "Just to oblige you, Murch—especially as I know you don't believe a word of it. First: no traces of any kind left by your burglar or burglars, and the window found fastened in the morning—according to Martin. Not much force in that, I allow. Next: nobody in the house hears anything of this stampede through the library, nor hears any shout from Manderson either inside the house or outside. Next: Manderson goes down without a word to anybody, though Bunner and Martin are both at hand. Next: did you ever hear in your long experience of a householder getting up in the night to pounce on burglars, who dressed himself fully, with underclothing, shirt, collar and tie, trousers, waistcoat and coat, socks and hard leather shoes; and who gave the finishing touches to a somewhat dandified toilet by doing his hair and putting on his watch and chain? Personally, I call that over-dressing the part. The only decorative detail he seems to have forgotten is his teeth."

The inspector leaned forward thinking, his large hands clasped before him. "No," he said at last. "Of course there's no help in that theory. I rather expect we have some way to go before we find out why a man gets up before the servants are awake, dresses himself fully, and is murdered within sight of his house early enough to be cold and stiff by ten in the morning."

Trent shook his head. "We can't build anything on that last consideration. I've gone into the subject with people who know. I shouldn't wonder," he added, "if the traditional notions about loss of temperature and rigor after death had occasionally brought an innocent man to the gallows, or near it. Dr. Stock has them all, I feel sure: most general practitioners of the older generation have. That Dr. Stock will make an ass of himself at the inquest is almost as certain as that to-morrow's sun will rise. I've seen him. He will say the body must have been dead about so long, because of the degree of coldness and rigor mortis. I can see him nosing it all out in some text-book that was out of date when he was a student. Listen, Murch, and I will tell you some facts which will be a great hindrance to you in your professional career. There are many things that may hasten or retard the cooling of the body. This one was lying in the long dewy grass on the shady side of the shed. As for rigidity, if Manderson died in a struggle, or laboring under sudden emotion, his corpse might stiffen practically instantaneously: there are dozens of cases noted, particularly in cases of injury to the skull, like this one. On the other hand, the stiffening might not have begun until eight or ten hours after death. You can't hang anybody on rigor mortis nowadays, inspector, much as you may resent the limitation. No; what we can say is this. If he had been shot after the hour at which the world begins to get up and go about its business, it would have been heard and very likely seen, too. In fact, we must reason—to begin with, at any rate—on the assumption that he wasn't shot at a time when people might be awake—it isn't done in these parts. Put that time at six-thirty a. m. Manderson went up to bed at eleven p. m. and Martin sat up till twelve-thirty. Assuming that he went to sleep at once on turning in, that leaves us something like six hours for the crime to be committed in; and that is a long time. But whenever it took place, I wish you would suggest a reason why Manderson, who was a fairly late riser, was up and dressed at or before six-thirty; and why neither Martin, who sleeps lightly, nor Bunner, nor his wife heard him moving about, or letting himself out of the house. He must have been careful. He must have crept about like a cat.... Do you feel as I do, Murch, about all this: that it is very, very strange and baffling?"

"That's how it looks," agreed the inspector.