 The woman who reached the bottom steps, Mrs. Wilcox, disappeared. I stooped over to cartway one. She was dead. A personal pistol fire came from the upstairs part of the house. A moment later, Inspector Doyle came tumbling down the stairs. A gun fell in his hand. He was unconscious. I looked up. At the top of the stairs stood Mrs. Laura Wilcox. She said nothing, but calmly came down