Jim Meeker came down from Montana to run Texas cattle only to find that Hopalong Cassidy's Bar-20 ran the water. When a trio of snake-mean rustlers started themselves a cattle war, the powder was primed, and the guns were cocked. It's friend against friend, brother against brother, and gun against blazing gun. All hell has broken loose and Hopalong Cassidy is smack in the middle of it all. Hoppy and the Bar-20 crew must stop a range war before the range runs red with blood.