"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."