The novel begins with Poirot boarding the luxurious in Istanbul for a journey to London. The trip is interrupted when a massive snowdrift stalls the train in the mountainous Balkans.

With the train isolated, Poirot interviews the diverse passengers, each appearing to have a solid alibi. However, inconsistent clues—like a woman in a scarlet kimono and a stopped pocket watch—lead Poirot to realize that the "impossible" must be possible.

A standout in the Golden Age of detective fiction, is one of Agatha Christie’s most famous works, featuring the legendary detective Hercule Poirot . The Story: A Closed-Room Classic

Poirot quickly uncovers Ratchett’s true identity: he is Cassetti , a notorious criminal who kidnapped and murdered a three-year-old American girl, Daisy Armstrong , years prior. Although he was guilty, his wealth allowed him to escape legal punishment.