Ubojstvo u Orijent-ekspresu

Poirot is traveling on a famous train when it is stopped by a blizzard in Yugoslavia. During the night, a murder occurs: Samuel Ratchett, a wealthy American, is found dead in his compartment, stabbed multiple times. Poirot, with the help of Dr. Constantine and the train conductor Bouc, begins the investigation. Ratchett's compartment is locked from the inside, and clues - including strange objects such as a handkerchief and a pipe cleaner - point to a complex case.

By questioning the passengers, who include characters as diverse as the Russian Princess Dragomiroff, an American actress, a Hungarian count and an English governess, Poirot discovers that Ratchett is actually Cassetti, the criminal responsible for the kidnapping and death of a young girl, Daisy Armstrong. Each passenger has a connection to the Armstrong family, and their alibis and stories intertwine, creating a web of lies.

Through ingenious analysis of the evidence and psychological acumen, Poirot uncovers an extraordinary solution: all twelve passengers participated in the murder, seeking revenge for Daisy. Faced with a moral dilemma, Poirot allows the travelers to escape justice, and a false version of events is officially accepted.