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 realises that this time he is dealing with a murderer of enormous cunning and that in a case frought with fear and inconstencies only one thing is certain - the murderer is still aboard the train waiting to strike again.