Roy is reluctant to work for a woman but intrigued by her prize racehorse, Arizona Lady; the two inevitably fall in love, but many complications ensue.
[4] In 1920s Arizona, a Hungarian woman, Lona Farrell, whose father had emigrated to the US to search for gold, now runs the Sunshine Ranch.
Meanwhile, Nellie Nettleton, proprietor of a mobile general store, meets young Chester Kingsbury, Jr., the son of a meat-packing millionaire who has sent him to the Sunshine Ranch to toughen him up.
The Sheriff turns up, and Roy says he will cross the line back into Arizona to surrender to him, but only if he can have ten minutes to speak to Lona alone.
The Sheriff reenters, and tells Roy that he is free to go, that Jim Slaughter, who was the real Burt Morton, has been arrested, along with Sr. Ibanez, and that Arizona Lady has been recovered.
The horse does indeed win, but Sheriff Sullivan, recognizing that Lona is really in love with "Roy", declares that the wedding will go on, with a slight change of bridegroom.