It was adapted by Margaret Turnbull from the 1912 play of the same name by David Belasco and Edward Locke.
The film stars Blanche Sweet, Theodore Roberts, James Neill, Carlyle Blackwell, Jane Wolfe, and Gertrude Kellar.
Dorothy, victim of the influence that the hypnotist Balzamo has on her, the man who raised her, develops a second personality with a malevolent character named Becky.
When Dorothy becomes friends with Dr. Emerson's sister, she transforms into Becky and the doctor diagnoses her with a case of split personality.
Arnold, who has fallen in love with Dorothy, is ready to "kill" Becky, but suddenly Balzamo reappears trying to regain control of the young woman.