Pick pocket Lily and also thief Gaston Monescu are partners in crime and love. Employed by perfume company executive Mariette Colet, the two crooks opt to unite their criminal abilities to commemorate their employer. Since the personal secretary of Mariette, Gaston uses his location under the alias of Monsieur Laval. He takes things too far when he it has to choose between her and Lily, also falls deeply in love with Mariette.