Parisian cabaret performer Lilli de Rousseau (Billie Dove), performing as Jean d'Arc on stage, is asked to leave the country by several diplomats as she is a distraction to high-ranking officers. She is set up with a villa in Italy, and Captain Tonnino (Luis Alberni) as her guardian. Lilli is also smitten by Lieutenant Roger Craig (Chester Morris) who has a reputation as a "Don Juan". She keeps her identity a secret from Roger, and begins to woo him, but remains elusive.