When he arrived at Medicine Hat, Somers Randison's initiation into cowboy ways was both disillusioning and violent, and in a very short time he had succeeded in arousing the enmity of Gringo, a cunning, sharp-shooting Mexican half-breed, who swore vengeance on the interfering tenderfoot. Even when Randison joined forces with the Mounted Police to solve the mystery of Noisy Pangborn's murder he was constantly reminded that Gringo's words had been no idle threat. The tension snapped during the great cattle round-up, when Randison found himself face to face with his enemy. In the fight which followed and the subsequent stampede of maddened cattle Randison learned the true meaning of a fight to the finish against nature untamed. This is a full-blooded Western story, told at breakneck speed to the exhilarating accompaniment of thundering hooves and roaring gun-play.