Versailles - The King of France has twin daughters: Madeleine, well mannered and virginal; and Jacqueline, perverse and sexually obsessed. Before leaving on a sea voyage, he locks the wayward Jacqueline in the tower, forcing her to wear an iron mask. Later, however, pirates attack the royal ship and Francois, Madeleine's fiancé, is dispatched to search for the missing King. Meanwhile, Jacqueline uses her erotic charms on her guard, Maximillian, convincing him to help her escape. She takes the place of Madeleine and soon the future of France is in jeopardy as she cuts a sexual swathe through the government. Eventually, Francois returns to save the day, and Jacqueline has to flee from the palace with Maximillian. Madeleine, who has been wrongfully imprisoned and constrained to war the iron mask, is now free to marry the man she loves.