A lady bank robber becomes the cell block boss after she's sent to prison.

Nan Taylor is arrested after acting as a decoy during a bank robbery. David Slade, a radio evangelist who has been calling publicly for tougher prosecution of criminals, recognizes Nan as a former classmate whose father was the deacon in the town where Slade's father was the town drunk. Taking advantage of his obvious attraction to her, Nan protests her innocence and begs for his help. Walter Simpson, the district attorney, agrees to parole her to Slade's care, although he is skeptical about her claims. When she confesses to Slade that she actually was involved in the robbery, however, Slade withdraws his support and Nan is sentenced to prison. In prison, she refuses to see Slade despite his frequent pleas, thereby attracting the hatred of fellow prisoner Susie, who is jealous of Slade's interest in Nan. After Nan learns that Don and Dutch, members of her gang, have been arrested, she agrees to see Slade in order to further their escape plans. She slips a letter into Slade's pocket which contains vital information about the plot, and through no fault of Slade's, the letter falls into the hands of the police and the escape fails. Nan's parole is denied because of her part in the crime, during which both Don and Dutch were killed. She believes that Slade betrayed her, so when she is finally released, she hunts him down, intending to kill him. Pretending to be sorry for her crimes, she meets with him privately, and then shoots him. Instantly remorseful, she apologizes, and when the police arrive, Slade tells them that he and Nan are getting married.