The hell called Yuma Prison can destroy the soul of any man. For two men facing life sentences—Harold Jackson, the only black man behind the walls, and Raymond San Carlos, an Apache half-breed—a pardon seems impossible.

But even in the worst place on Earth, there's hope. And for these two hard and hated inmates—first enemies, then allies by necessity—it comes in the form of a mad and violent contest . . . to track down and hunt Arizona's five most wanted outlaws.