The son of a British earl, Philip Champion is exiled to Paris after having served a prison term to shield his wife and there forms an alliance with his brother-in-law, Marcel, who conducts a fashionable gambling establishment as the head of a band of criminals. Marcel is arrested and sent to prison, and Champion escapes. Ambrose, a hunchbacked street musician, escapes with Christine, Champion's daughter, and frames Champion for robbery. While visiting Marcel, whom she believes to be her father, Christine swears to kill Champion. Gilbert Hannaway, an amateur criminologist, informs her in London that the man she seeks is now Lord Ellingham; however, in an attempt on his life, she discovers that he is her true father. Marcel escapes but is killed by Ambrose, who also dies, and the money is recovered from his street organ by a monkey. Hannaway and Christine become engaged.