Pinkerton detective Nimrod Dunn is hired by Lieutenant Governor Maddox Kingsley to infiltrate an outlaw gang. But when Nimrod's cover is blown, an innocent life is lost in the raging gun battle. The fearsome US Marshal Jake T. Devine then sets about bringing the outlaw Cornelius to justice - but his methods are as brutal as those whom he pursues. With Devine's blood-soaked trail making a mockery of the governor's promise to clean up the county, Maddox must call on Nimrod's services once more - to kill Marshal Devine ...