Returning to the scruffy town of Valentine, Texas, after many months of tracking wanted criminals, Cahill learns that there's been trouble at home as well. The local sheriff and deputy have been murdered by a masked gang of bandits. These outlaws robbed the bank and then disappeared into the hills. Deputizing his elder son, Cahill sets out to routinely track and capture the dangerous desperadoes. Instead, the gritty marshal finds himself up against an adversary he had never counted on and finds out that his sons are involved in the robbery.