 Jerry Cummings (Forrest Taylor), a mining engineer, has pledged a large diamond on a short-term note to a pair of crooked loan sharks, Crone (Monte Hale) and Jan Jaffin (Jack Mulhall), and heads for Mexico. His daughter Betsy (Joan Barclay), posing as a jewel thief called Mary Layton, is working to keep the crooks from absconding with the jewel, and her efforts are hindered greatly by an artist, Jimmy Baxter (Herman Brix), who thinks she is a crook and Crone and Jaffin the good guys.