Toi, Le Venin (aka Nude In A White Car) (1959)

On an evening walk, a drifter (Robert Hossein) is lured into a car by a mysterious blonde whose face is hidden by the dark. After (presumably) having had sex, she pulls a gun on him, kicks him out of the car and tries to run him over. Determined to uncover her identity, he traces the car to a home with two attractive blonde sisters. One (Marina Vlady) is in a wheelchair, the other (Odile Versois) is her caretaker. But which is the nude in the white car? Based on the novel by Frederic Dard and directed by Robert Hossein (WICKED GO TO HELL). A family affair: director and star Hossein was married to Marina Vlady at the time and Odile Versois is Vlady's real sister. It's an intriguing mystery with noir-ish trimmings. Hossein keeps us off kilter through out the movie as he shifts suspicion from sister to sister so we're never quite sure who is the psychotic. Is Vlady faking her not being able to walk? Is Versois gaslighting the sister and the drifter into thinking Vlady is faking it? Are the sisters in it together? Why? What's the motivation. Worth checking out for mystery and noir fans. With Helena Manson and Lucien Callmand.