John MacKenzie swears revenge! Talbot and his cattle thieves hired by Patton, the squire of Holbrook, who would like to seize half of Arizona at the expense of the breeders, have destroyed one of his herds destined to Tex’s Navajos, killing some of his men. Meanwhile, in town, the bad mood against Sheriff Walker is whipped up on purpose, to have him undermined by Jerry Nolan, one of the boss’ hangers-on. And while MacKenzie and his men are about to fall into a deadly trap that Patton’s hired ruffians have laid for him, the pards arrive just in time to settle the shoot-out!