A swashbuckling heritage reveals itself as the adopted son of 19th-century Spaniards develops into a suave lady-killer.

France, July 1782. During her birthday, the beautiful young Marchioness Caroline meets the attractive soldier Gaston. It's love at first sight but Gaston does not wish to make a commitment because a military career waits for him. Caroline marries then a politician but the French Revolution bursts and Caroline has to run away to escape the guillotine. By running away she meets Gaston again who decides to help her.

Caroline de Bienre, the 16-year-old daughter of French nobility, meets the handsome rogue, Gaston de Sallanches, who is expected to ask for the hand of her older, plainer sister in marriage. Gaston instead joins Caroline in her secret hiding place in the château's attic, where the infatuated Caroline begins an affair with him. Meanwhile, she is being courted by the dull, sincere Livio, but holds him off since she is in love with Gaston. When the revolution of 1789 breaks out Caroline is sent to a convent but her carriage is waylaid. She escapes and makes her way to Gaston's home, where she finds him in the arms of his mistress. She is angry and then agrees to marry Livio, now an out-of-favor revolutionary and a marked man, and Caroline is also now on the death list.