On a ship from Alexandria to Marseille, Édouard Binet meets Nemrod Loktum, a shady Egyptian businessman, and Sylvie Baron, a Belgian exotic dancer. Nemrod is robbed and killed. Édouard then takes a room at the boarding house in Charleroi of Madame Baron, Sylvie’s mother, with bloodstained clothes and a lot of money that he hides. Despite the suspicions of her younger daughter Antoinette and the other lodgers, the frosty Madame Baron is gradually charmed by the suave Frenchman and believes his stories. But the police is after him.