After Alice Winton's brother Ned embezzles funds belonging to his employer, Benjamin Graves, a promoter of worthless mining stock, she saves him from arrest by signing over to Graves a hefty promissory note. Later Graves deliberately wrecks the mining company in which Alice's invalid father has invested all of his money, and the resulting bankruptcy causes the old man to die from shock. Alice marries Robert Burton, a noted criminologist who believes in the theory, "once a thief, always a thief," and the couple takes up temporary residence with District Attorney Jeffrey Miller. In Miller's safe are incriminating documents concerning Graves's illegal activities, and Graves, knowing of their existence, blackmails Alice into stealing them by showing her some compromising love letters to which he has forged her name. As Alice robs the safe, Ned, who has been arrested for larceny and is now being tested by the reform-minded district attorney, discovers her. After Ned hears of Graves's misdeeds, the burglar alarm sounds, and he and Alice are spotted. Casting suspicion on himself, Ned swears revenge on Graves and flees. Fearful, Alice goes to Graves's apartment, finds him dead just as the police arrive, and is implicated in the crime. At that moment, however, Rose La Vere, Graves's jilted lover, staggers in and, before dying from self-induced poison, confesses to the murder, thus clearing both Alice and her brother.