Jeanne Lefarge is seriously injured when her car runs over a cliff in the Adirondack Mountains. During her recovery at a nearby hotel, Jeanne weds a married doctor named Richard Sterling. He soon abandons Jeanne, resulting in her attempted suicide. Forced to leave the hotel, Jeanne sails to Paris, France, where she conspires with two confidence men and becomes a heartless, scheming woman known as "The Vampire." Foreign governments hire Jeanne to steal secret papers from U.S. attaché Robert Sterling, but she falls in love with him instead. Upon learning that Robert is the son of the man who abandoned her, Jeanne vows to wreck his life. Following her return to New York City, however, Jeanne’s love overcomes her desire for vengeance. She plans to marry Robert, who breaks his engagement to his childhood sweetheart. Richard attempts to convince his son that Jeanne is an adventuress, but she forces him to reveal the truth. Later, one of Jeanne's co-conspirators tries to steal the papers, and she intercepts a bullet aimed at Robert. As she lies dying, Jeanne reunites Robert and his sweetheart.