Amidst rumors of a conspiracy by the Axis powers to diminish America's capacity to engage in hostilities, the FBI is called into action. Special Agent Chess Power is empowered by Deputy Director Melvin Purvis to put together a plan to thwart the efforts of a mysterious team known as the Triad. Power heads out to Alcatraz Island and enlists the aid of criminal genius Alvin Karpis in return for his parole. Karpis agrees on condition that his partners Fred and Doc Barker and Harry Campbell are included in the deal. Power agrees, and the game of cat and mouse soon begins.