Antony went out of the house again to the lawns at the back, and sat down on a bench in view of the office windows.
“Now then,” he said, “let’s go through Cayley’s mind carefully, and see what we get.”
Cayley had been in the hall when Robert was shown into the office. The servant goes off to look for Mark, and Cayley goes on with his book. Mark comes down the stairs, warns Cayley to stand by in case he is wanted, and goes to meet his brother. What does Cayley expect? Possibly that he won’t be wanted at all; possibly that his advice may be wanted in the matter, say, of paying Robert’s debts, or getting him a passage back to Australia; possibly that his physical assistance may be wanted to get an obstreperous Robert out of the house. Well, he sits there for a moment, and then goes into the library. Why not? He is still within reach, if wanted. Suddenly he hears a pistol-shot. A pistol-shot is the last noise you expect to hear in a country-house; very natural, then, that for the moment he would hardly realize what it was. He listens—and hears nothing more. Perhaps it wasn’t a pistol-shot after all. After a moment or two he goes to the library door again. The profound silence makes him uneasy now. Was it a pistol-shot? Absurd! Still—no harm in going into the office on some excuse, just to reassure himself. So he tries the door—and finds it locked!
What are his emotions now? Alarm, uncertainty. Something is happening. Incredible though it seems, it must have been a pistol-shot. He is banging at the door and calling out to Mark, and there is no answer. Alarm—yes. But alarm for whose safety? Mark’s, obviously. Robert is a stranger; Mark is an intimate friend. Robert has written a letter that morning, the letter of a man in a dangerous temper. Robert is the tough customer; Mark the highly civilized gentleman. If there has been a quarrel, it is Robert who has shot Mark. He bangs at the door again.
Of course, to Antony, coming suddenly upon this scene, Cayley’s conduct had seemed rather absurd, but then, just for the moment, Cayley had lost his head. Anybody else might have done the same. But, as soon as Antony suggested trying the windows, Cayley saw that that was the obvious thing to do. So he leads the way to the windows—the longest way.
Why? To give the murderer time to escape? If he had thought then that Mark was the murderer, perhaps, yes. But he thinks that Robert is the murderer. If he is not hiding anything, he must think so. Indeed he says so, when he sees the body; “I was afraid it was Mark,” he says, when he finds that it is Robert who is killed. No reason, then, for wishing to gain time. On the contrary, every instinct would urge him to get into the room as quickly as possible, and seize the wicked Robert. Yet he goes the longest way round. Why? And then, why run?
“That’s the question,” said Antony to himself, as he filled his pipe, “and bless me if I know the answer. It may be, of course, that Cayley is just a coward. He was in no hurry to get close to Robert’s revolver, and yet wanted me to think that he was bursting with eagerness. That would explain it, but then that makes Cayley out a coward. Is he? At any rate he pushed his face up against the window bravely enough. No, I want a better answer than that.”
He sat there with his unlit pipe in his hand, thinking. There were one or two other things in the back of his brain, waiting to be taken out and looked at. For the moment he left them undisturbed. They would come back to him later when he wanted them.
He laughed suddenly, and lit his pipe.
“I was wanting a new profession,” he thought, “and now I’ve found it. Antony Gillingham, our own private sleuthhound. I shall begin today.”
Whatever Antony Gillingham’s other qualifications for his new profession, he had at any rate a brain which worked clearly and quickly. And this clear brain of his had already told him that he was the only person in the house at that moment who was unhandicapped in the search for truth. The inspector had arrived in it to find a man dead and a man missing. It was extremely probable, no doubt, that the missing man had shot the dead man. But it was more than extremely probable, it was almost certain that the Inspector would start with the idea that this extremely probable solution was the one true solution, and that, in consequence, he would be less disposed to consider without prejudice any other solution. As regards all the rest of them—Cayley, the guests, the servants—they also were prejudiced; in favour of Mark (or possibly, for all he knew, against Mark); in favour of, or against, each other; they had formed some previous opinion, from what had been said that morning, of the sort of man Robert was. No one of them could consider the matter with an unbiased mind.
But Antony could. He knew nothing about Mark; he knew nothing about Robert. He had seen the dead man before he was told who the dead man was. He knew that a tragedy had happened before he knew that anybody was missing. Those first impressions, which are so vitally important, had been received solely on the merits of the case; they were founded on the evidence of his senses, not on the evidence of his emotions or of other people’s senses. He was in a much
