Longley has been a special marshal to the Texas town of Rio Nada. The area has been plagued by Mexican bandits who have used to the cross the border into the United States and raid the countryside. The gang is led by a mysterious leader known only as "El Sombro". When Longley captures an agent for El Sombro, he hopes to use the threat of hanging for the attempted murder of a deputy sheriff to force him to identify the illusive bandit chief. (Note to viewers: Best to first view "The Terrified Tow