Gertie Jones, known among other thieves as "The Chatterbox" because she talks to herself while she works, becomes a rich woman's French maid after learning about her employer's $40,000 diamond necklace. To cover up the scratches left by her tools after she unsuccessfully tries to open the safe containing the necklace, Gertie telephones the police to report an attempted burglary. Jimmy Hartigan, a famous thief, arrives and after he and Gertie fall in love at first sight, he is arrested. After Gertie helps Jimmy escape from prison, they move to New York and continue their illegal endeavors until they see Gertie's sister, whose time in prison has left her consumptive, and a famous crook, now a broken wreck, and decide to go straight for each other's sake. As the "Harts," they buy a farm in New Jersey after foiling the plans of a crooked real estate promoter. When Kersey, a detective on Jimmy's trail, arrives, Jimmy and Gertie pretend to save him from two escaped convicts. The grateful detective, believing that the "Harts" have reformed, refuses to recognize them as the "Hartigans."