Smashing the Money Ring

In the third of a four film series, Secret Service agent "Brass" Bancroft, is assigned to uncover a counterfeiting ring that operates inside the walls of the state prison. "Dice" Matthews, former convict and the ring's 'outside man' decides to distribute the the counterfeit bills from a gambling ship anchored outside the three-mile-limit. Bancroft and his assistant, "Gabby" Watters, pick up the trail from there, and then Bancroft goes undercover in the prison, as a convict, to land the ringleader.