Katherine shook her head. “I don’t think I saw anyone at all,” she said. “There was a youngish lad in a cap and overcoat who got out, but I don’t think he was leaving the train, only walking up and down the platform. There was a fat Frenchman with a beard, in pyjamas and an overcoat, who wanted a cup of coffee. Otherwise, I think there were only the train attendants.”

Poirot nodded his head several times. “It is like this, you see,” he confided, “the Comte de la Roche has an alibi. An alibi, it is a very pestilential thing, and always open to the gravest suspicion. But here we are!”

They went straight up to Van Aldin’s suite, where they found Knighton. Poirot introduced him to Katherine. After a few commonplaces had been exchanged, Knighton said: “I will tell Mr. Van Aldin that Miss Grey is here.”