"What you say about Lawrence is a great surprise to me," I said.
"But why? It was most obvious. Did not Monsieur Lawrence make the sour face every time Mademoiselle Cynthia spoke and laughed with his brother? He had taken it into his long head that Mademoiselle Cynthia was in love with Monsieur John. When he entered his mother's room, and saw her obviously poisoned, he jumped to the conclusion that Mademoiselle Cynthia knew something about the matter. He was nearly driven desperate. First he crushed the coffee-cup to powder under his feet, remembering that she had gone up with his mother the night before, and he determined that there should be no chance of testing its contents. Thenceforward, he strenuously, and quite uselessly, upheld the theory of 'Death from natural causes'."
"And what about the 'extra coffee-cup'?"
"I was fairly certain that it was Mrs. Cavendish who had hidden it, but I had to make sure. Monsieur Lawrence did not know at all what I meant; but, on reflection, he came to the conclusion that if he could find an extra coffee-cup anywhere his lady love would be cleared of suspicion. And he was perfectly right."
"One thing more. What did Mrs. Inglethorp mean by her dying words?"
"They were, of course, an accusation against her husband."
"Dear me, Poirot," I said with a sigh, "I think you have explained everything. I am glad it has all ended so happily. Even John and his wife are reconciled."
"Thanks to me."
"How do you mean--thanks to you?"
"My dear friend, do you not realize that it was simply and solely the trial which has brought them together again? That John Cavendish still loved his wife, I was convinced. Also, that she was equally in love with him. But they had drifted very far apart. It all arose from a misunderstanding. She married him without love. He knew it. He is a sensitive man in his way, he would not force himself upon her if she did not want him. And, as he withdrew, her love awoke. But they are both unusually proud, and their pride held them inexorably apart. He drifted into an entanglement with Mrs. Raikes, and she deliberately cultivated the friendship of Dr. Bauerstein. Do you remember the day of John Cavendish's arrest, when you found me deliberating over a big decision?"
"Yes, I quite understood your distress."
"Pardon me, mon ami, but you did not understand it in the least. I was trying to decide whether or not I would clear John Cavendish at once. I could have cleared him--though it might have meant a failure to convict the real criminals. They were entirely in the dark as to my real attitude up to the very last moment--which partly accounts for my success."