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The legendary detective, intricate cases, dangerous criminals. He is helped out by his old friend Monsieur Bouc, the owner of the company that owns the train. In the morning, while having breakfast, the detective notices that the passengers on the train are people of different nationalities who have accidentally found themselves in the same carriage. The American Ratchett, who seems too suspicious to Poirot, asks the detective to become his bodyguard. But he refuses. At night, Poirot is constantly woken up by various sounds and knocks, and then silence falls - because of snow drifts, the train stops somewhere in Yugoslavia, the passengers are tense, and the strange Mr Ratchett lies dead in his compartment... Detective Poirot begins to investigate.