“He tried to speak. His soft hands gesticulated wildly, but I was half lying on one arm and held the other. “I whispered in his ear: “'Nobody will know who killed you, Kara, think of that! I shall go scot free--and you will be the centre of a fine mystery! All your letters will be read, all your life will be examined and the world will know you for what you are!' “I released his arm for just as long as it took to draw my knife and strike. I think he died instantly,” John Lexman said simply. “I left him where he was and went to the door. I had not much time to spare. I took the candles from my pocket. They were already ductile from the heat of my body. “I lifted up the steel latch of the door and propped up the latch with the smaller of the two candles, one end of which was on the middle socket and the other beneath the latch. The heat of the room I knew would still further soften the candle and let the latch down in a short time. “I was prepared for the telephone by his bedside though I did not know to whither it led. The presence of the paper-knife decided me. I balanced it across the silver cigarette box so that one end came under the telephone receiver; under the other end I put the second candle which I had to cut to fit. On top of the paper-knife at the candle end I balanced the only two books I could find in the room, and fortunately they were heavy. “I had no means of knowing how long it would take to melt the candle to a state of flexion which would allow the full weight of the books to bear upon the candle end of the paper-knife and fling off the receiver. I was hoping that Fisher had taken my warning and had gone. When I opened the door softly, I heard his footsteps in the hall below. There was nothing to do but to finish the play. “I turned and addressed an imaginary conversation to Kara. It was horrible, but there was something about it which aroused in me a curious sense of humour and I wanted to laugh and laugh and laugh! “I heard the man coming up the stairs and closed the door gingerly. What length of time would it take for the candle to bend! “To completely establish the alibi I determined to hold Fisher in conversation and this was all the easier since apparently he had not seen the envelope I had left on the table downstairs. I had not long to wait for suddenly with a crash I heard the steel latch fall in its place. Under the effect of the heat the candle had bent sooner than I had expected. I asked Fisher what was the meaning of the sound and he explained. I passed down the stairs talking all the time. I found a cab at Sloane Square and drove to my lodgings. Underneath my overcoat I was partly dressed in evening kit.