We were sitting in a state of tense attention to listen to Poirot's final explanation of the case.

"All along," he said, "I have been worried over the why of this case. Hastings said to me the other day that the case was ended. I replied to him that the case was the man! The mystery was not the mystery of the murders, but the mystery of A B C. Why did he find it necessary to commit these murders? Why did he select me as his adversary?

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