It had been my original intention, when I thought over this plan of murder, to let Levy disappear from the study or the dining-room, leaving only a heap of clothes on the hearth-rug. The accident of my having been able to secure Lady Levy’s absence from London, however, made possible a solution more misleading, though less pleasantly fantastic. I turned on the hall light, hung up Levy’s wet overcoat and placed his umbrella in the stand. I walked up noisily and heavily to the bedroom and turned off the light by the duplicate switch on the landing. I knew the house well enough, of course. There was no chance of my running into the man-servant. Old Levy was a simple old man, who liked doing things for himself. He gave his valet little work, and never required any attendance at night. In the bedroom I took off Levy’s gloves and put on a surgical pair, so as to leave no tell-tale finger-prints. As I wished to convey the impression that Levy had gone to bed in the usual way, I simply went to bed. The surest and simplest method of making a thing appear to have been done is to do it. A bed that has been rumpled about with one’s hands, for instance, never looks like a bed that has been slept in. I dared not use Levy’s brush, of course, as my hair is not of his colour, but I did everything else. I supposed that a thoughtful old man like Levy would put his boots handy for his valet, and I ought to have deduced that he would fold up his clothes. That was a mistake, but not an important one. Remembering that well-thought-out little work of Mr. Bentley’s, I had examined Levy’s mouth for false teeth, but he had none. I did not forget, however, to wet his tooth-brush.
At one o’clock I got up and dressed in my own clothes by the light of my own pocket torch. I dared not turn on the bedroom lights, as there were light blinds to the windows. I put on my own boots and an old pair of goloshes outside the door. There was a thick Turkey carpet on the stairs and hall-floor, and I was not afraid of leaving marks. I hesitated whether to chance the banging of the front door, but decided it would be safer to take the latchkey. (It is now in the Thames. I dropped it over Battersea Bridge the next day.) I slipped quietly down, and listened for a few minutes with my ear to the letter-box. I heard a constable tramp past. As soon as his steps had died away in the distance I stepped out and pulled the door gingerly to. It closed almost soundlessly, and I walked away to pick up my cab. I had an overcoat of much the same pattern as Levy’s, and had taken the precaution to pack an opera hat in my suitcase. I hoped the man would not notice that I had no umbrella this time. Fortunately the rain had diminished for the moment to a sort of drizzle, and if he noticed anything he made no observation. I told him to stop at 50 Overstrand Mansions, and I paid him off there, and stood under the porch till he had driven away. Then I hurried round to my own side door and let myself in. It was about a quarter to two, and the harder part of my task still lay before me.