Thief Gaston Monescu (Herbert Marshall) and pickpocket Lily (Miriam Hopkins) are partners in crime and love. Working for perfume company executive Mariette Colet (Kay Francis), the two crooks decide to combine their criminal talents to rob their employer. Under the alias of Monsieur Laval, Gaston uses his position as Mariette's personal secretary to become closer to her. However, he takes things too far when he actually falls in love with Mariette, and has to choose between her and Lily.