Nancy Glenn is a pupil in Pop Hogland's school for crooks. When, attired as a boy named "Spider," Nancy fails at her lessons as a pickpocket, Pop decides to pair her with Pliny Drew, a graduate thief and swindler. Nancy rebels at her proposed partnership with Pliny, and after she is involved in an auto accident and rescued by wealthy young Ralph Harding who takes her to his home to recover, Nancy pretends to have lost her memory. Gradually, Ralph falls in love with the girl, and his mother accepts her as one of the family. However, when Pliny attempts to involve Ralph in a mining swindle, Nancy sacrifices her security and exposes the plan, thus saving her benefactor. Learning of the conditions which drove her into life at the edge of the law, Ralph forgives Nancy and they face a happy life together.