"But someone else quarreled with Sir Reuben," continued Poirot in a pensive voice. "Someone else left him that night white with rage. Supposing Lady Astwell left her husband alive at a quarter to twelve that night, there would be ten minutes before Mr Charles Leverson returned, ten minutes in which it would be possible for someone from the second floor to steal down and do the deed, and then return to his room again."
Victor Astwell sprang up with a cry.
"What the hell —?" He stopped, choking with rage.
"In a rage, Mr Astwell, you once killed a man in West Africa."
"I don't believe it," cried Lily Margrave.
She came forward, her hands clenched, two bright spots of color in her cheeks.
"I don't believe it," repeated the girl. She came close to Victor Astwell's side.
"It's true, Lily," said Astwell, "but there are things this man doesn't know. The fellow I killed was a witch doctor who had just massacred fifteen children. I consider that I was justified."
Lily came up to Poirot.
"M. Poirot," she said earnestly, "you are wrong. Because a man has a sharp temper, because he breaks out and says all kinds of things, that is not any reason why he should do a murder. I know — I know, I tell you — that Mr Astwell is incapable of such a thing."
Poirot looked at her, a very curious smile on his face. Then he took her hand in his and patted it gently.
"You see, Mademoiselle," he said gently, "you also have your intuitions. So you believe in Mr Astwell, do you?"
Lily spoke quietly.
"Mr Astwell is a good man," she said, "and he is honest. He had nothing to do with the inside work of the Mpala Gold Fields. He is good through and through, and — I have promised to marry him."
Victor Astwell came to her side and took her other hand.
"Before God, M. Poirot," he said, "I didn't kill my brother."
"I know you did not," said Poirot.
His eyes swept around the room.
"Listen, my friends. In an hypnotic trance, Lady Astwell mentioned having seen a bulge in the curtain that night."
Everyone's eyes swept to the window.
"You mean there was a burglar concealed there?" exclaimed Victor Astwell. "What a splendid solution!"
"Ah!" said Poirot gently. "But it was not
He wheeled around and pointed to the curtain that masked the little staircase.
"Sir Reuben used the bedroom the night prior to the crime. He breakfasted in bed, and he had Mr Trefusis up there to give him instructions. I don't know what it was that Mr Trefusis left in that bedroom, but there was something. When he said good night to Sir Reuben and Lady Astwell, he remembered this thing and ran up the stairs to fetch it. I don't think either the husband or wife noticed him, for they had already begun a violent discussion. They were in the middle of this quarrel when Mr Trefusis came down the stairs again.
"The things they were saying to each other were of so intimate and personal a nature that Mr Trefusis was placed in a very awkward position. It was clear to him that they imagined he had left the room some time ago. Fearing to arouse Sir Reuben's anger against himself, he decided to remain where he was and slip out later. He stayed there behind the curtain, and as Lady Astwell left the room she subconsciously noticed the outline of his form there.
"When Lady Astwell had left the room, Trefusis tried to steal out unobserved, but Sir Reuben happened to turn his head, and became aware of the secretary's presence. Already in a bad temper, Sir Reuben hurled abuse at his secretary, and accused him of deliberately eavesdropping and spying.
"Messieurs and Mesdames, I am a student of psychology. All through this case I have looked, not for the bad-tempered man or woman, for bad temper is its own safety valve. He who can bark does not bite. No, I have looked for the good-tempered man, for the man who is patient and self-controlled, for the man who for nine years has played the part of the under dog. There is no strain so great as that which has endured for years, there is no resentment like that which accumules slowly.
"For nine years Sir Reuben has bullied and browbeaten his secretary, and for nine years that man has endured in silence. But there comes a day when at last the strain reaches its breaking point. Something snaps! It was so that night. Sir Reuben sat down at his desk again, but the secretary, instead of turning humbly and meekly to the door, picks up the heavy wooden club, and strikes down the man who had bullied him once too often."
He turned to Trefusis, who was staring at him as though turned to stone.
"It was so simple, your alibi. Mr Astwell thought you were in your room, but
Trefusis began to stammer.