A border war rages on the Rio. Jeb & Zach battles to rescue Jeb’s 14-year-old niece Becky, kidnapped across the border. Roseanne tends Jeb after he’s wounded, but it’s Zach who walks her home each night. After his recovery, Jeb asks Roseanne’s help in finding dynamite her boss has hidden. Jeb and Zach use the dynamite to rescue Becky, but the Mexican bandits crosses the border and captures them and holds the town hostage. Jeb & Zach bring the Cavalry to free Becky and Roseanne. She loves them both, but which one will she choose?