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Stop Thief was adapted from the popular Broadway comedy of the same name, with Mary Ryan repeating her original stage role. The story revolves around a pair of thieves, Nell Jones (Ryan) and Jack Doogan (Harry Mestayer), and their efforts to go straight. But before they can do so, Nell and Jack decide to pull off one last "big job." To this end, Nell takes a servant's job in the home of a wealthy family, intending to allow Jack access into the house in the dead of night. After several items of value are stolen, Nell's employers are convinced that they themselves are kleptomaniacs, whereupon they hire a detective to protect the house from themselves. The "detective" is none other than Jack, in a classic case of the fox guarding the chicken coop! Ultimately, Nell and Jack are caught in the act, but their employers decide to let them go free -- but only on the condition that the larcenous pair get married immediately and promise steadfastly never to steal again.