Disatified with the Fourth Cavalry's success at combating cattle rustlers, the Matthews family hires Sam Bates as a scout to track the outlaws, not realizing that Bates is, in fact, the gang's leader. After Bates leads the Matthews boys into a deadly ambush, he sets his sights on bigger game - leading Mackenzie himself into a trap, not realizing that the Colonel has set a trap of his own.
