The Mauch Twins return in this fast-paced adventure, the third and final film in the Penrod series, loosely based on the stories by Pulitzer Prize-winning author Booth Tarkington.

Roberta (Bonita Granville) is raised in a wealthy home, and she is ignored by her busy parents. As her behavior worsens, she is placed in a boarding school for troubled girls, and she is given responsibilities to teach her manners.

A G-man (Pat O'Brien) falls in love with the aloof ex-mate (Margaret Lindsay) of a gangster convict (Cesar Romero), who escapes.