Lieutenant Varnière, responsible for discovering the cause of the death of two officers in Algeria, unmasks the assassin in the person of a Russian who lives with three women. He falls in love with one of them and runs away with her while the Russian is killed by a devoted servant.
Robert Lanier, a man with a doubtful past, disembarks clandestinely in Le Havre decided to rebuild his life. Johnny, an orphaned young acrobat, takes him for his father and presents him to the seductive Gaby, his best friend.
