T-Man Brass Bancroft goes undercover in a prison which has a secret counterfeit operation set up in the print shop.

Larry Willis and Bill Wane are security guards who ride in the back of Banks Co. armored trucks. When they barely avoid a robbery, they return to headquarters, where their boss John Hale introduces them to detective Tom Sheridan, who will be working with them to uncover a new gang of robbers.

After Police Captain Dan McLaren becomes police commissioner, former detective Johnny Blake publicly punches him, convincing rackets boss Al Kruger that Blake is sincere in his effort to join the mob. "Bugs" Fenner, meanwhile, is certain that Blake is a police agent.

Torchy Blane solves a murder and smuggling case during a round-the-world flight.

Ex-Army officer Jameson takes a job a prison guard at San Quentin. Joe, the brother of his new girlfriend May, is sentenced to the prison for robbery. When Jameson tries to separate lawbreakers from hardened criminals, badguy Hansen tries to stir up trouble by telling Joe about Jameson's interest in his sister.

Perry and Della are finally married by his old friend, Judge Mary. They plan to go on a honeymoon, but before it can start, Perry is retained by a woman with a gun and $5000.

A recently released prisoner lives alone in his cabin so that his bad temper won't get him back in any more trouble, but his peaceful existence is disrupted when a mysterious woman arrives.

Based on the Hammett novel, this ultra-rare film—is nominally taken from the author's classic gang-war novel Red Harvest, which proved too brutal and cynical even for pre-Code Hollywood.