Chorus girl Mary Brown promises to give herself to playboy cad John Duane in exchange for $2500 so she can pay back a theft her brother made from his employers. Her sweetheart, race-car driver Jimmie, learns about it and gives her a check for $2500, but the check is worthless unless he can win the Big Race that afternoon. He leads through every lap but blows a tire on the last lap and finishes fourth. It appears that Duane will soon be hugging sweet Mary, unless Jimmie can find a buyer for a race-car with a flat tire.

Whether they’re all dressed up and in full make-up, or looking as much as possible like the Virgin Mary, the inhabitants of the red light district in the Mexican border city of Tijuana live in a world of their own. The notorious neighborhood of Zona Norte is their home, but their minds are always elsewhere.