Cattleman's Association detective Steve Donovan arrives in an Arizona border town searching for rustlers. Chief among these is Black Bart who, among his many crimes, also mistreats his stepkids Lucy and crippled little Davey. A dog also departs rather quickly when Black Bart is around. Steve beats up Bart in a fight at a town barn dance over Bart's treatment of Lucy. Sonny Carns, a semi-good bad man who has hired out to run cattle over the border for Bart, takes part by keeping henchman Pedro from knifing Steve. Carns also saves Steve's life once more before Bart meets his just end from an unexpected source.
—Les Adams <longhorn1939@suddenlink.net>