" and endless inconvenience. But have I not heard you say often that to solve a case a man has only to lie back in his chair and think? Do that. Interview the passengers on the train, view the body, examine what clues there are and then—well, I have faith in you! I am assured that it is no idle boast of yours. Lie back and think—use (as I have heard you say so often) the little grey cells of the mind—and you will know!” He leaned forward, looking affectionately at his friend. “Your faith touches me, my friend,” said Poirot emotionally. “As you say, this cannot be a difficult case. I myself, last night—but we will not speak of that now. In truth, this problem intrigues me. I was reflecting, not half an hour ago, that many hours of boredom lay ahead whilst we are stuck here. And now—a problem lies ready to my hand.” “You accept then?” said M. Bouc eagerly. “C’est entendu. You place the matter in my hands.” “Good—we are all at your service.” “To begin with, I should like a plan of the Istanbul-Calais coach, with a note of the people who occupied the several compartments, and I should also like to see their passports and their tickets.” “Michel will get you those.” The Wagon Lit conductor left the compartment. “What other passengers are there on the train?” asked Poirot. “In this coach Dr. Constantine and I "

― Agatha Christie , Murder on the Orient Express (Hercule Poirot, #9)