An international cast of suspects, all passengers on the crowded train, are speeding through the snowy European landscape when a bizarre and terrible murder brings them to an abrupt halt. One of their glittering number lies dead in his cabin, stabbed a mysterious twelve times. There is no lack of clues for Poirot--but which clue is real and which is a clever plant? Poirot realizes that this time he is dealing with a murderer of enormous cunning and that in a case fraught with fear and inconsistencies only one thing is certain--the murderer is still aboard the train waiting to strike again.