In 1930, a horrific kidnapping and murder case occurred in New York, and the mastermind Cassetti escaped with ransom. Five years later, detective Herculi Polo (Albert Finney) sailed across the Bosphorus and, under the arrangements of his friend Bianchi (Martin Balsam), boarded the Orient Express for London. Early one morning, Polo was awakened by the cries of private room No. 10 next door. Subsequently, the train was forced to stop in Yugoslavia because snow drifts buried the tracks. Not long after Poirot fell asleep again, he was awakened by the noise. Lady Harriet Belinda Hubbard (Lauren Bacall) claims that the millionaire Rachel (Richard Widmark) in Room 10 sneaked into her Room 11. After dawn, Ratchett's housekeeper Bedos (John Gielgud) brought drinks, but couldn't knock on the door of Private Room 10. Train conductor Pierre-Paul Michel (Jean-Pierre Cassel) used a key to unlock the lock, but there was a door chain hanging inside. Poirot and Pierre worked together to open the door and found that Rechett was bleeding from the corner of his mouth and died with his eyes closed. After examination by doctor Constantine (George Kuroulis), Rechett was drugged and was stabbed 12 times. The time of death was 0 o'clock...