12 Crowded Hours stars stalwart Richard Dix as crime-busting reporter Nick Green, who within the course of a single night (hence the title) topples a gangland empire.
Hoping to gather enough evidence to send numbers racketeer Costain (Cyrus W. Kendall), Green enlists the aid of his fiancee Paula Sanders (Lucille Ball), whose brother Dave (Allen Lane) is innocently mixed up with Costain's mob. The villain tips his hand by murdering four people-including Green's night editor, when he loses $80,000 in a double-cross.