While en route from Syria to Paris, in the middle of a freezing winter's night, the Orient Express is stopped dead in its tracks by a snowdrift. Passengers awake to find the train still stranded and to discover that a wealthy American has been brutally stabbed to death in his private compartment. Incredibly, that compartment is locked from the inside. With no escape into the wintery landscape the killer must still be on board. Fortunately, the brilliant Belgian inspector Hercule Poirot is also on board, having booked the last available berth.