When Theodore Roosevelt assists a Sioux brave in finding his stolen horses, they help identify a notorious horse thief. Though found innocent of murder, the Marquis de Morés must still repair his damaged reputation with his father-in-law.

A Chicago cattle baron sends two enforcers to make deals with Medora's cattlemen, leading to a deadly confrontation with the Marquis de Morés. Sensing trouble, one of Theodore Roosevelt's Elkhorn men heads off to Montana to find some help.

When a ruthless Chicago cattle baron invades Medora with a legion of gunslingers, Theodore Roosevelt must join forces with his old adversary, the Marquis de Morés. Together, they hatch a plan to save their town from certain destruction.