"What I had to do there you know. I had to take off the shoes and put them outside the door, leave Manderson's jacket, waistcoat, trousers and black tie, after taking everything out of the pockets, select a suit and tie and shoes for the body, and place the dental plate in the bowl, which I moved from the washing-stand to the bedside, leaving those ruinous finger-marks as I did so. The marks on the drawer must have been made when I shut it after taking out the tie. Then I had to lie down in the bed and tumble it. You know all about it—all except my state of mind, which you couldn't imagine, and I couldn't describe.
"The worst came when I had hardly begun my operations; the moment when Mrs. Manderson spoke from the room where I supposed her asleep. I was prepared for it happening; it was a possibility; but I nearly lost my nerve all the same. However....
"By the way, I may tell you this: in the extremely unlikely contingency of Mrs. Manderson remaining awake and so putting out of the question my escape by way of her window, I had planned simply to remain where I was a few hours, and then, not speaking to her, to leave the house quickly and quietly by the ordinary way. Martin would have been in bed by that time. I might have been heard to leave, but not seen. I should have done just as I had planned with the body, and then made the best time I could in the car to Southampton. The difference would have been that I couldn't have furnished an unquestionable alibi by turning up at the hotel at six-thirty. I should have made the best of it by driving straight to the docks and making my ostentatious inquiries there. I could in any case have got there long before the boat left at noon. I couldn't see that anybody could suspect me of the supposed murder in any case; but if any one had, and if I hadn't arrived until ten o'clock, say, I shouldn't have been able to answer: 'It is impossible for me to have got to Southampton so soon after shooting him.' I should simply have had to say I was delayed by a break-down after leaving Manderson at half-past ten, and challenged any one to produce any fact connecting me with the crime. They couldn't have done it. The pistol, left openly in my room, might have been used by anybody, even if it could be proved that that particular pistol was used. Nobody could reasonably connect me with the shooting so long as it was believed that it was Manderson who had returned to the house. The suspicion could not, I was confident, enter any one's mind. All the same, I wanted to introduce the element of absolute physical impossibility; I knew I should feel ten times as safe with that.
"So when I knew from the sound of her breathing that Mrs. Manderson was asleep again I walked quickly across her room in my stocking feet and was on the grass with my bundle in ten seconds. I don't think I made the least noise. The curtain before the window was of soft, thick stuff and didn't rustle, and when I pushed the glass doors further open there was not a sound."
"Tell me," said Trent as the other stopped to light a new cigarette, "why you took the risk of going through Mrs. Manderson's room to escape from the house? I could see when I looked into the thing on the spot why it had to be on that side of the house; there was a danger of being seen by Martin or by some servant at a bedroom window if you got out by a window on one of the other sides. But there were three unoccupied rooms on that side: two spare bedrooms and Mrs. Manderson's sitting-room. I should have thought it would have been safer, after you had done what was necessary to your plan in Manderson's room, to leave it quietly and escape through one of those three rooms.... The fact that you went through her window, you know," he added coldly, "might have suggested, if it became known, a certain suspicion in regard to the lady herself. I think you understand me."
Marlowe turned upon him with a glowing face. "And I think you will understand me, Mr. Trent," he said in a voice that shook a little, "when I say that if such a possibility had occurred to me then, I would have taken any risk rather than make my escape by that way.... Oh, well!" he went on more coolly, "I suppose that to any one who didn't know her the idea of her being privy to her husband's murder might not seem so indescribably fatuous. Forgive the expression." He looked attentively at the burning end of his cigarette, studiously unconscious of the red flag that flew in Trent's eyes for an instant at his words and the tone of them.
That emotion, however, was conquered at once. "Your remark is perfectly just," Trent said with answering coolness. "I can quite believe, too, that at the time you didn't think of the possibility I mentioned. But surely, apart from that, it would have been safer to do as I said: go by the window of an unoccupied room."
"Do you think so?" said Marlowe. "All I can say is I hadn't the nerve to do it. I tell you, when I entered Manderson's room I shut the door of it on more than half my terrors. I had the problem confined before me in a closed space, with only one danger in it, and that a known danger: the danger of Mrs. Manderson. The thing was almost done: I had only to wait until she was certainly asleep after her few moments of waking up, for which, as I told you, I was prepared as a possibility. Barring accidents, the way was clear. But now suppose that I, carrying Manderson's clothes and shoes, had opened that door again and gone in my shirt-sleeves and socks to enter one of the empty rooms. The moonlight was flooding the corridor through the end-window. Even if my face were concealed, nobody could mistake my standing figure for Manderson's. Martin might be going about the house in his silent way. Bunner might come out of his bedroom. One of the servants who were supposed to be in bed might come round the corner from the other passage—I had found Célestine prowling about quite as late as it was then. None of these things was very likely; but they were all too likely for me. They were uncertainties. Shut off from the household in Manderson's room I knew exactly what I had to face. As I lay in my clothes in Manderson's bed and listened for the almost inaudible breathing through the open door I felt far more ease of mind, terrible as my anxiety was, than I had felt since I saw the dead body on the turf. I even congratulated myself that I had had the chance, through Mrs. Manderson's speaking to me, of tightening one of the screws in my scheme by repeating the statement about my having been sent to Southampton."
Marlowe looked at Trent, who nodded as who should say that his point was met.
"As for Southampton," pursued Marlowe, "you know what I did when I got there, I have no doubt. I had decided to take Manderson's story about the mysterious Harris and act it out on my own lines. It was a carefully prepared lie, better than anything I could improvise. I even went so far as to get through a trunk call to the hotel at Southampton from the library before starting, and ask if Harris was there. As I expected, he wasn't."