Four people, passengers on a train, are mysteriously murdered in this complex whodunit. Simone Signoret, Yves Montand. Eric: Jean-Louis Trintignant. Bambi: Catherine Allegret. Patron: Pierre Mondy. Georgette: Pascale Roberts. Daniel: Jacques Perrin. Bob: Charles Denner. Excellent cast. Slick direction by Costa Gavras.