But even if they were not as they appeared; if Manderson was dead by eleven o'clock, and if at about that time Marlowe impersonated him at White Gables; if Marlowe retired to Manderson's bedroom—how can all this be reconciled with his appearance next morning at Southampton? He had to get out of the house, unseen and unheard, and away in the car by midnight. And Martin, the sharp-eared Martin, was sitting up until twelve-thirty in his pantry, with the door open, listening for the telephone bell. Practically he was standing sentry over the foot of the staircase, the only staircase leading down from the bedroom floor.
With this difficulty we arrive at the last and crucial phase of my investigation. Having the foregoing points clearly in mind, I spent the rest of the day before the inquest in talking to various persons and in going over my story, testing it link by link. I could only find the one weakness which seemed to be involved in Martin's sitting up until twelve-thirty; and since his having been instructed to do so was certainly a part of the plan, meant to clinch the alibi for Marlowe, I knew there must be an explanation somewhere. If I could not find that explanation my theory was valueless. I must be able to show that at the time Martin went up to bed, the man who had shut himself in Manderson's bedroom might have been many miles away on the road to Southampton.
I had, however, a pretty good idea already—as perhaps the reader of these lines has by this time, if I have made myself clear—of how the escape of the false Manderson before midnight had been contrived. But I did not want what I was now about to do to be known. If I had chanced to be discovered at work, there would have been no concealing the direction of my suspicions. I resolved not to test them on this point until the next day, during the opening proceedings at the inquest. This was to be held, I knew, at the hotel, and I reckoned upon having White Gables to myself so far as the principal inmates were concerned.
So in fact it happened. By the time the proceedings at the hotel had begun, I was hard at work at White Gables. I had a camera with me. I made search, on principles well known to and commonly practised by the police, and often enough by myself, for certain indications. Without describing my search, I may say at once that I found and was able to photograph two fresh finger-prints, very large and distinct, on the polished front of the right-hand top drawer of the chest of drawers in Manderson's bedroom; five more (among a number of smaller and less recent impressions made by other hands) on the glasses of the French window in Mrs. Manderson's room, a window which always stood open at night with a curtain before it; and three more upon the glass bowl in which Manderson's dental plate had been found lying.
I took the bowl with me from White Gables. I took also a few articles which I selected from Marlowe's bedroom, as bearing the most distinct of the innumerable finger-prints which are always to be found upon toilet-articles in daily use. I already had in my possession, made upon leaves cut from my pocket diary, some excellent finger-prints of Marlowe's, which he had made in my presence without knowing it. I had shown him the leaves, asking if he recognized them; and the few seconds during which he had held them in his fingers had sufficed to leave impressions which I was afterward able to bring out.
By six o'clock in the evening, two hours after the jury had brought in their verdict against a person or persons unknown, I had completed my work, and was in a position to state that two of the five large prints made on the window-glasses, and the three on the bowl, were made by the left hand of Marlowe; that the remaining three on the window and the two on the drawer were made by his right hand.
By eight o'clock I had made at the establishment of Mr. H. T. Copper, photographer, of Bishopsbridge, and with his assistance, a dozen enlarged prints of the finger-marks of Marlowe, clearly showing the identity of those which he unknowingly made in my presence and those left upon articles in his bedroom, with those found by me as I have described, and thus establishing the facts that Marlowe was recently in Manderson's bedroom, where he had in the ordinary way no business, and in Mrs. Manderson's room, where he had still less. I hope it may be possible to reproduce these prints for publication with this despatch.
At nine o'clock I was back in my room at the hotel and sitting down to begin this manuscript. I had my story complete.
I bring it to a close by advancing these further propositions: that on the night of the murder the impersonator of Manderson, being in Manderson's bedroom, told Mrs. Manderson, as he had already told Martin, that Marlowe was at that moment on his way to Southampton; that having made his dispositions in the room, he switched off the light, and lay in the bed in his clothes; that he waited until he was assured that Mrs. Manderson was asleep; that he then arose and stealthily crossed Mrs. Manderson's bedroom in his stocking feet, having under his arm the bundle of clothing and shoes for the body; that he stepped behind the curtain, pushing the doors of the window a little further open with his hands, strode over the iron railing of the balcony, and let himself down until only a drop of a few feet separated him from the soft turf of the lawn.
All this might very well have been accomplished within half an hour of his entering Manderson's bedroom, which according to Martin he did at about half-past eleven.