Billy Coy (Mickey Rooney) arrives in the town of Carrell, California and offers himself as a mechanic for Arthur "Red" Stanley (Thomas Mitchell (actor)) at his garage. Red turns down Billy initially, but after seeing a photo of his father, "Cannonball" Coy, a famous driver, Red scares up a job for Billy. Billy's father died in an accident at the Indianapolis 500 several years previously. Red was Cannonball's mechanic, riding with him the day he died in the north turn of the Indianapolis motor speedway. Red inquires after "her"; he still carries a torch for Mary (Spring Byington), Cannonball's widow and Billy's mother.