'Sparke' Thorton, a lad with a penchant for trouble, is sent to live with his Uncle and Aunt Bolt in Indiana after his Aunt Henrietta Bolt dies. Though he's not happy about the arrangement at first, his love of horses and his affection for a young filly that he plans to race make life bearable. He also finds romance with tomboyish 'Char' Bruce who shares his love for horses.