“But I understand nothing—but nothing of all this! The enemy that this Ratchett spoke of, he was then on the train after all? But where is he now? How can he have vanished into thin air? My head, it whirls. Say something, then, my friend, I implore you. Show me how the impossible can be possible!” “It is a good phrase that,” said Poirot. “The impossible cannot have happened, therefore the impossible must be possible in spite of appearances.”
