After having squared up with the untrustworthy Sheriff of Sheldon, an accomplice of the cattle raiders that operate against Louis Cardigan’s Sunset Ranch, Tex and Carson discover that this deception is holding out thanks to the complicity of the breeder’s unworthy son, the dandy Randy. The guy has fallen into the clutches of the gang led by the professional swindler Chris Hogan; the bandits modify the branding on Cardigan’s cattle, hide the cattle on the lands of the cheating breeder Owens and then make the stolen cattle disappear in Mexico.