20 year old Betty Lee becomes famous for her movie stunts with airplanes and high power roadsters. While horseback riding, she allows Ensign Tom Manley to believe that he has saved her from a runaway; then at the studio he meets her suitor, Carl D'Arcy. Betty evades Carl's marriage proposal and accepts Tom's luncheon invitation. Through a trick, she delays him in meeting his ship, and at the last minute, Betty, along with Tom and her press agent, Soapy Taylor, burn up the road to San Diego. Through Carl's plotting, the police arrest Betty for speeding and sentence her to 10 days in jail, although she manages to deliver Tom on time. Carl, trailed by revenue officers, shifts blame to Hilda, a chambermaid whom he has deceived, and she meets Betty in jail. Soapy plans a jail wedding for Carl and Betty as a publicity stunt, but Tom exposes Carl and wins the hand of Betty.