Sheila's uncle has just died; many of his relatives come, but,much to their displeasure, it's his niece who inherits his private detective agency. But she must first go through a training in a school: gymnastic, assault course, machine gun shooting; she must also learn how to cheat at card games .Her first mission is to find back gangster La Rafale's fiancee, Genevieve, who ran away with another gang. She meets a handsome Interpol lieutenant she falls in love with.