Bat Masterson roams the frontier and defends the innocent.

Bat goes to Jackson Hole, Wyo., to investigate the murder of an old friend at the request of his daughter; the family's freight business faces bankruptcy due to the unsolved murders of its drivers.

Bat Masterson's friend asks for help when rival gambling house owner Big Keel Roberts threatens his casino, with the conflict coming down to a poker game between Bat and Roberts for ownership of both establishments.

An old foe mysteriously bequeaths his casino to Bat; when Bat arrives in Shotgun Falls, Wyo., to claim the inheritance, he discovers he must deal with a crippling mortgage and a murderous marshal determined to take control of the property.

Gambler George Winston breaks the bank at Bat's casino using underhanded methods, and after pursuing Winston and his bodyguard, Burt Comers, Bat learns the men have an accomplice on the inside.