“Ah! mon cher.” M. Bouc’s voice became positively caressing. “I know your reputation. I know something of your methods. This is the ideal case for you. To look up the antecedents of all these people, to discover their bona fides—all that takes time 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
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