The story of Texas Ranger Zack Branson continues when he is reassigned to El Paso, Texas. He collaborates with his cousin, U.S. Marshal Cal Branson, to try to control the rustling and banditry on the border between the U.S. and Mexico. Zack and Cal chase a group of Mexican bandits across the Rio Grande River, confront them in a cantina at a small pueblo, and get involved in a shootout. While Cal is honeymooning, Zack and El Paso County Sheriff White go after cattle rustlers that were busted out of jail. Sammy Blue Fox, an old Apache who tracked Geronimo, signs on to help them find the escapees and the man who killed the jailer during the escape. The chase ends in a stalemate. Who will walk away and who will die is uncertain until the last shot is fired.