On Derby day at Epsom Downs, Lord Charles Sheridan is ready to photograph the race with his new camera. The race is marred, however, by the death of a jockey. While her husband investigates the death, Kate Sheridan retreats to the country to interview actress Lillie Langtry for a magazine article. As Kate plunges into Langtry's past, Charles's investigation heads toward Langtry as well.