"Aces" Powell prospected in the Gila Mountains until he nearly went mad. Knowing the terrain, he is recruited by the sheriff to join a posse and hunt down the merciless killer, Coffin Jack. When Aces catches up with the posse he finds them all hanging from a tree. Thus begins a cat-and-mouse thriller between Aces and a savage killer set against a backdrop of the lawless west, where peace balances on a knife's edge and where vengeance takes on a life of its own.