In Blood Moon, the Tucson Kid rides out of Mexico just ahead of a gang of Mexican bandits who are after him to take revenge for the killing of their chief. He moves into New Mexico where he finds himself in the middle of a range war between a brutal rancher and a beautiful widow who is fighting desperately to maintain control of her land. The story rushes to a violent climax as the Tucson Kid takes his stand with the widow against the rancher. In the final battle, Tucson is caught in the cross-fire between the rancher and his hired killers and the Mexican outlaws who have finally caught up with him.