Garage owner Harry Stone buys a racehorse Brownie from Peggy Lanstone and according to formula hires Peggy as the steeds trainer When the filly finishes a mere second in the Oaks Harrys snooty fiancee Muriel who never liked the setup anyway disgustedly heads for greener pastures Harry promptly marries Peggy and after an official investigation of the Oaks results Brownie gets revenge on the fickle Muriel