"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 Celestine 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." "Was that why you telephoned?" Trent inquired quickly. "The reason for telephoning was to get myself into an attitude in which Martin couldn't see my face or anything but the jacket and hat, yet which was a natural and familiar attitude. But while I was about it, it was obviously better to make a genuine call. If I had simply pretended to be telephoning, the people at the exchange could have told you at once that there hadn't been a call from White Gables that night." "One of the first things I did was to make that inquiry," said Trent. "That telephone call, and the wire you sent from Southampton to the dead man, to say Harris hadn't turned up and you were returning--both those appealed to me."