Outlaw Express plot
The government sends cavalry captain Bob Bradley to an area where the mail drivers of the 'Pony Express' are killed by arrows and their mail bags stolen. Bob and his friend Sergeant Andy Sharpe go incognito as horse traders. Their investigation centers around Don Ricardo Hernandez's ranch. Bob and Andy also get to know Don's beautiful daughter Lorita. They discover that Jack Sommers and his accomplice Phelps are taking possession of huge ranches along the border with Mexico. One Ramon, an unloyal rancher of Don Ricardo Hernandez and accomplice of Sommers, turns out to kill the mail drivers of the 'Pony Express' with arrows, to blame the Indians.