At the death of Count de Beaulieu, his daughter Jeanne learns that her father had been the arch criminal known as The Phantom. The only other person who knew her father's identity was his lieutenant, Franz Leroux, who now demands that Jeanne marry him in return for his silence. She agrees and they go to America where Jeanne meets an old friend, Jane Elliot. Jeanne confides her secret to Jane, and the two decide to flee to Florida. When en route their train is wrecked and Jane killed, Jeanne, in order to protect herself from her criminal husband, assumes Jane's identity. Posing as Jane, she visits the Marstons and falls in love with Henry Marston. Soon after, Leroux arrives and Jeanne is forced to tell her story. While explanations are in progress, one of Leroux's confederates, whom he had double-crossed, kills the criminal. Henry then forgives Jeanne her deception and together they begin a new life.