1965 French film
The Sleeping Car Murders (also known as The Sleeping Car Murder, French title: Compartiment tueurs) is a 1965 French mystery film directed by Costa-Gavras from the novel by Sébastien Japrisot. It stars Yves Montand, Simone Signoret, Michel Piccoli, Jean-Louis Trintignant, Catherine Allégret, Jacques Perrin, Charles Denner and Pascale Roberts. The film was the directorial debut of Costa-Gavras, to be followed later by other, more politically-oriented work.
Plot summary adapted from Wikipedia, licensed under CC BY-SA 4.0.