HE lay in bed on his back as the doctor had described him. On the left side of his nightgown, just over his heart, the blood on the linen told its terrible tale. As well as one could judge, looking unwillingly at a dead face, he must have been a handsome young man in his lifetime. It was a sight to sadden anybody--but I think the most painful sensation was when my eyes fell next on his miserable wife. She was down on the floor, crouched up in a corner--a dark little woman, smartly dressed in gay colors. Her black hair and her big brown eyes made the horrid paleness of her face look even more deadly white than perhaps it really was. She stared straight at us without appearing to see us. We spoke to her, and she never answered a word. She might have been dead--like her husband--except that she perpetually picked at her fingers, and shuddered every now and then as if she was cold. I went to her and tried to lift her up. She shrank back with a cry that well-nigh frightened me--not because it was loud, but because it was more like the cry of some animal than of a human being. However quietly she might have behaved in the landlady's previous experience of her, she was beside herself now. I might have been moved by a natural pity for her, or I might have been completely upset in my mind--I only know this, I could not persuade myself that she was guilty. I even said to Mrs. Crosscapel, "I don't believe she did it." While I spoke there was a knock at the door. I went downstairs at once, and admitted (to my great relief) the Inspector, accompanied by one of our men. He waited downstairs to hear my report, and he approved of what I had done. "It looks as if the murder had been committed by somebody in the house." Saying this, he left the man below, and went up with me to the second floor. Before he had been a minute in the room, he discovered an object which had escaped my observation. It was the knife that had done the deed. The doctor had found it left in the body--had withdrawn it to probe the wound--and had laid it on the bedside table. It was one of those useful knives which contain a saw, a corkscrew, and other like implements. The big blade fastened back, when open, with a spring. Except where the blood was on it, it was as bright as when it had been purchased. A small metal plate was fastened to the horn handle, containing an inscription, only partly engraved, which ran thus: "To John Zebedee, from--" There it stopped, strangely enough. Who or what had interrupted the engraver's work? It was impossible even to guess. Nevertheless, the Inspector was encouraged. "This ought to help us," he said--and then he gave an attentive ear (looking all the while at the poor creature in the corner) to what Mrs. Crosscapel had to tell him. The landlady having done, he said he must now see the lodger who slept in the next bed-chamber.