Pick pocket Lily and also thief Gaston Monescu are partners in crime and love. Working for cologne company executive Mariette Colet, the two crooks choose to combine their criminal abilities to commemorate their employer. Since the personal secretary of Mariette, Gaston uses his standing under the alias of Monsieur Laval. However, he takes things a lot when he it has to decide between her and Lily, and falls in love with Mariette.