Newly elected police court judge John Fairbrother is impassioned when it comes to the laws affecting the dives and cabarets of the city, and promises equal justice for all. The source of his crusading passion is the loss of his own sister to the lure of the notorious Johnson Café years earlier. His wife Grace's two prominent brothers, newspaper editor George Ferguson and Episcopal Bishop William Ferguson, worked hard to elect Fairbrother to office, and although they are initially puzzled by the judge's intent to shut down dance halls and cabarets, they agree to stand behind him after he confides to them about his fallen sister. However, on the day when Fairbrother takes his seat on the bench, he is called upon to sentence Mace and Lily, two young women arrested for disorderly conduct during a police raid on the same Johnson's Café that claimed the purity and ultimately the life of his sister. Lily is a brazen city girl, while Mace is a shy "country mouse" who fell into bad company.