Posing as a hangman, Mace Bishop arrives in town with the intention of freeing a gang of outlaws, including his brother, from the gallows. Mace urges his younger brother to give up crime. The sheriff chases the brothers to Mexico. They join forces, however, against a group of Mexican bandits.
Karate champion Matt Logan is enlisted by the police to train officers in self-defense after narcotics agents are killed by an assailant using the martial arts.