It is also revealed not too far in that Inspector Bouchet (Jacques Marin), also known as "Double X" as a code name to the thieves, is the mastermind behind the museum robbery, though the fact of his scheme is revealed near the end of the movie. It is the eager, and somewhat knee-jerk and unpunctual young detective Fontenoy (Xavier Saint-Macary), of whom the Inspector is the superior officer, who unravels the mystery of L'Étoile de Joie, and has Bouchet clapped in handcuffs.