Since reluctantly accepting the marshal's job at South Pass City, Jake Paynter's life has become an unending run of solving other people's problems. When outlaw boss Dutch van Zandt and his ruthless band mount a campaign of mayhem in Jake's corner of the Wyoming Territory, Jake learns that Lucien Ashley, his persistent adversary, may be aiding the criminals to expand his burgeoning cattle fortune. The fact that Lucien is the brother of Rosalyn, a woman Jake admires, complicates matters.