John Douglas divorces his wife, taking custody of their son Kenneth and leaving her with their little daughter Kathleen. Mrs. Douglas dies in poverty, and Kathleen falls in with crook Jack Baggot and his wife, who teach her how to pick pockets. Later she is adopted by Mrs. Preston, a wealthy woman who rears her in an atmosphere of elegance and refinement, but after Jack's release from prison, he forces Kathleen to steal Mrs. Preston's diamond necklace. Kenneth, a guest at the Preston home, sees her at the safe and, not realizing that she is his sister, falls in love with her. He takes the necklace from Jack and then uses it to lure Kathleen to his room late one night. When he tries to attack her, she kills him. Howard Murray, her sweetheart, assumes the blame, but she confesses her guilt to Kenneth's father, who realizes in horror that she is his long-lost daughter. His name cleared, Howard is released and joined to Kathleen.