Chet Byrnes has his hands full taking care of his family and running his ranching operation in Arizona Territory. But he still takes his responsibilities as a deputy U.S. marshal very seriously. Bandits have been crossing the border, cutting a bloody swath of mayhem--stealing horses, robbing banks, and murdering innocent folk--then high-tailing it back to safety in Mexico. The chief U.S. marshal asks Chet to lead a secret task force to stop the raids and round up the border bandits--dead or alive. But the bandits fight back--putting a five-hundred-dollar bounty on Chet's head. Now he's got bushwhackers to deal with, and when he's led into an ambush, it's kill or be killed in a life-or-death showdown.