The narrative begins on a rainy night in San Francisco where a mysterious girl named Mary Smith is rescued by a rugged cowboy known as Cultus Collins. Soon after, Collins is dispatched by the Cattle Association to investigate irregularities at the Lazy A ranch in Oreana City, following the death of its grim owner, Jud Ault. Arriving in the southwest, Collins assumes the alias Jones of Oklahoma to infiltrate the region and uncover the truth behind the local cattle rustling and a long-standing feud between the Lazy A and the Star X ranches.
Meanwhile, a cunning plot unfolds orchestrated by the corrupt local lawyer Miles Lane and the ruthless Lazy A foreman Idaho Breen. They scheme to usurp the ranch by introducing an impostor as the true heir to the estate, forging a fraudulent will that disinherits Ault's real daughter, Faith. As tensions mount between the rival ranches, Collins quietly investigates the rustling operations, uncovering hidden cattle hides and exposing the deceit at the heart of the community.
Through careful detective work, Collins connects the conspirators to a larger web of crime originating in California. The confrontation culminates in a violent showdown in Oreana City, where Breen and Lane's conspiracy is laid bare. Lane confesses to the forgery and murder conspiracy just before dying, clearing the name of the innocent and returning the estate to its rightful owner, Faith Keene.
In the aftermath, the bitter feud between the ranches dissolves into peace and reconciliation. Mary Smith finds a new life and romance with Dude Wheeler, one of the Star X ranchers, while Collins reflects on his adventurous mission. The story concludes with double weddings and a restored community, proving that integrity ultimately triumphs over greed and deception.
