A brother and sister take on the drug ring that caused their father's death.

Margaret Holt and her brother Victor set out to smash a narcotics ring responsible for their father's death: Victor becomes a district attorney and weaves a net around the gang and its leader Marco, alias James Morton, while Margaret becomes Marco's secretary. Marco soon discovers her duplicity and is about to have his henchmen kill her brother when she stabs him with a paper cutter; but she is too late to save Victor. In desperation, she goes to apply for shelter and meets John Howell, a young reporter looking for a story, who promises to help. Winthrop Clavering, an eccentric author of mystery stories, employs Margaret as his secretary and unravels the truth about the murder. Meanwhile, Howell learns that Victor is being held prisoner by the gangsters. Learning the identity of Margaret, Clavering summons the gang to his apartment, where they are arrested; Howell rescues Victor and wins Margaret.