While celebrating his victory in the Redburne 200, stock car driver Frank Capua persuades Avis representative Elora to accompany him on a drive. When Elora voices concern for her reputation, revealing that she is a divorcée with a teenaged son and suspicious mother, Capua suggests an idyll in California. Upon their return they marry, and Capua adopts Elora's son, Charley. In preparation for the Indianapolis 500 the racer embarks on a grueling training program, neglecting his wife. Arriving at Elora's motel room, he discovers her in bed with his rival Luther Erding. Following a wordless confrontation Capua leaves Elora. Alarmed, Charley hitchhikes to Indianapolis and joins his stepfather, voicing the hope that Capua will best Erding in the upcoming race. Capua is victorious in the Indianapolis 500, after which he assaults his antagonist and pleads with Elora for a reconciliation.