Gold prospector Cheyenne Davis (Lash LaRue) and his partner, Fuzzy Jones, help rid a frontier town of dangerous outlaws. While en route to Temecula for supplies, Cheyenne happens upon a stage coach that has just been held up by a masked gang. Arriving in town, he finds it overrun by gunmen terrorizing the local populace. It doesn't take long for one of the unwanted guests to reveal a pocket full of rings, which Davis recognizes as items stolen in the recent robbery. Realizing that they've been discovered, the thieves are hell bent on eliminating the mysterious stranger, but Cheyenne proves to be no average gold prospector.
With his trademark bullwhip in tow, Lash LaRue first gained notoriety as The Cheyenne Kid, a character he portrayed in support of Eddie Dean in several PRC westerns. Law of the Lash was the first of eight PRC films to star LaRue as Cheyenne, which would find him paired with comic sidekick Al "Fuzzy" St. John. After the demise of PRC, LaRue and Fuzzy carried on with a series of films for Western Adventure Productions, which found the whip-wielding star reprising the same basic character, with the name Cheyenne Davis being discarded in favor of the Marshal Lash LaRue moniker.