Cast & Crew
Ira S. Webb
Bob rides across the Mexican border in search of the man who murdered his father years earlier. Along the trail to Borderville, he rescues Mary when her horse runs away, but is puzzled when she pulls a gun on him after he breaks up a fight between Frank, a rustler, and Dan, Bob's prankster sidekick. Mary and Frank ride back to town together, where Frank tells Buck Lambert, the head of a gang of rustlers, that Bob is a federal agent. Soon after, Bob walks into the Borderville Cafe, and Mary mysteriously warns him to leave town. Bob ignores her warning, though, and when Lambert and his men try to evict him forcibly, Mary asks rancher Herb Crenshaw for help. Under the pretense that Bob is the cattle thief known as "El Diablo," Herb takes him into custody and escorts Bob to his ranch. The next day, Mary rides out to the ranch and warns Herb that Lambert is planning to run a shipment of contraband the following day. They decide to use Bob as a messenger, but before Mary can give Bob the note pinpointing the location of the rustlers' hideout, Lambert discovers her eavesdropping and takes her prisoner. Hearing Mary's screams, Bob comes to her rescue and, in the ensuing fight, realizes that Lambert is his father's murderer. After tying Lambert up, Mary and Bob ride to meet Herb, but they are too late because he has become impatient and gone after the rustlers himself. As Bob rides to join Herb, Mary sends for the sheriff. At the rustlers' hideout, Bob and Herb shoot it out with the rustlers until the sheriff and his posse come to arrest them. Meanwhile, Lambert escapes, takes Mary hostage and wounds Herb, but Bob apprehends him and turns him over to the sheriff. With the rustlers brought to justice, Mary tells Bob that she and her brother Herb are federal agents, after which Bob proposes to her.
Ira S. Webb
Although the onscreen credits list Dan Milner as editor, modern sources credit S. Roy Luby with editing.