Not far from Belgrade, the luxurious Paris-Constantinople train, the Orient Express, is halted by a snow storm. An American millionaire is found dead in his compartment. The door is locked; the window is open. There are no tracks in the snow. The murderer must still be on the train. Hercule Poirot studies his fellow passengers. Is the criminal a Russian princess, a distinguished Hungarian, an English colonel, or even the company director, worried about a scan...