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.

Sheila hérite de l'agence de détectives privés de son défunt oncle. Les autres héritiers ne voit pas cette succession d'un très bon œil.

Sheila riceve in eredita' un'agenzia investigativa, di cui pero' diventera' proprietaria dopo un periodo di addestramento in un college inglese. Il suo primo caso sara' la ricerca della moglie di un noto gangster.