Molly Ashley, a child of the slums, is charged with being an accomplice to a shoplifter. Although innocent, she is convicted of shoplifting and sentenced to two years' imprisonment. Jim Tracy, the leader of a band of gangsters, rescues Molly. The following morning Detective Stone is assigned the task of locating and running down Jim Tracy's gang. To secure evidence against the gang, he disguises himself as one of the gangsters, runs into their place, and pretends that the "cops" are after him. Tracy and the gang take him in. Molly falls in love with Stone and discovers his true identity. One of the crooks gets sore at Jim and betrays them to the police. Jim accuses Molly of betraying them. Stone resents his accusation. A fight follows and Jim is killed. Stone takes Molly away and gives her a chance to be self-supporting.