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Unknown to prison authorities, the printing of counterfeit money has become a flourishing industry within the walls of their own institution. When gangster Dice Matthews tries to force casino owner Steve Parker to distribute the bills aboard his gambling ship, the Kismet , Parker anonymously notifies the police and then, to avoid the clutches of the mob, gets sentenced to prison for slugging a cop. Parker's tip alerts the secret service, and Lieutenant Brass Bancroft and his pal Gabby are assigned to the case. After Dice is arrested in a gambling raid and sentenced to the same prison as Parker, Brass goes undercover to contact Dice. Posing as a tough convict, Brass wins Dice's confidence, and the gangsters include him on a planned escape. Meanwhile, Parker tells his daughter Peggy that he plans to go straight, but the next morning, he is found murdered in his cell. Peggy remembers that Davis, a guard, overheard their conversation, but before Parker's murder can be solved, Brass and Dice break out of jail. On the road to meet the brains behind the counterfeiting ring, Dice tells Brass that the bills are counterfeited in the prison and then smuggled out in stacks of prison newspapers. Dice then introduces Brass to Davis, the head of the ring, who has learned that Brass is a secret service agent. Davis shoots both Dice and Brass, but Brass feigns death and escapes. Brass then returns to the prison to arrest Davis, who dies in a hail of gunfire.