Little Johnny Jones is a jockey who is in love with his all-American sweetheart, Mary Baker, and also his career as the rider of thoroughbred horses. But he almost loses both when he is tricked by a showgirl, Vivian Dale. His story of vindication swings from the racetracks of America to England and the historical National Derby, with plenty of red-white-and-blue bunting waving behind the little patriot.

Cuenta la historia de un jockey norteamericano que ganó el Gran Derby con un caballo llamado "Yanquee Doodle". Todo ello se adorna con unas tramas paralelas donde el jinete se ve atrapado por dos mujeres: una que realmente le quiere y una vampiresa que busca su perdición.