A Classic Action Adventure of the Old West on Cimarron Strip. A bank robber is murdered in the Cimarron jail and a hot-tempered cowpoke, Screamer (John Saxon), in an adjoining cell recognizes the assassin as the victim's boss, Ace Coffin (Henry Silva). Screamer offers to help Marshal Jim Crown (Stuart Whitman) track down the killer. However, he is so eager to lend his services that Crown questions his motives. It soon becomes apparent that the man's real reason for cooperating is that he knows that Coffin has a $10,000 price on his head and wants to nail the reward for himself. Meanwhile, Coffin is having his own troubles trying to control his mutinous followers, who resent his cold-blooded murder of one of their members and are stirred up about their failure to get the loot that had been promised them.