When US Marshal Harry Boudine buys outlaw Jack Morgan's freedom from Arizona's brutal Yuma Prison, the ex-lawman, soldier and gunfighter finds that he has to repay the debt in spades. Morgan's job is to stem the flow of US arms to the Mexican bandits and persuade the sick Confederate general, John J. De Wolfe, that the South will never again bear arms against its Northern brothers. During the long ride to Mexico, blood and bullets lace the air as Morgan outwits and out-shoots anything the hired gunfighters of Rancho Santa Cruz can throw at him. Even so, death still lurks behind every boulder and the success of Morgan's mission is always in doubt. Then, too, there is the strong and beautiful Stella Owens...