Isabelle and Richard Hamlin, Americans, are guests of the Count Di Varesi in Naples. Isabelle, gradually realizing that her husband is a rake, turns to Di Varesi. A duel between the men results in which Di Varesi is wounded, then Hamlin is suddenly paralyzed as he attempts to kill his wife. Feeling guilty, Isabelle resolves to devote her life to caring for her husband. Twenty years pass, the Hamlins are in Washington, and their daughter Rose is engaged to a young attorney. Di Varesi, now an attaché at the Italian Embassy there, learns that Rose is really his daughter and offers to settle a fortune on her. Discovering her true parentage, her fiancé breaks the engagement, after which a disillusioned Rose goes off to Monte Carlo as a woman of mystery with intentions of living a wild life. She is saved, however, by the love of Edwin Ford. Upon learning of Richard's death and the marriage of Isabelle and Di Varesi, Rose and Edwin return in happiness to America.