There's plenty of excitement at Epsom Downs, as Lord Charles Sheridan and his American wife, Kate, watch the races from a box shared by Jennie Jerome Churchill and world-renowned actress, mistress and horse-trader Lillie Langtry. But the real excitement comes that evening, when Charles is called to investigate both the death of a Derby jockey and the theft of Lillie Langtry's jewels. Before long, there are no safe bets as Kate and Charles are pulled into Lillie Langtry's reckless social world, where lords and ladies run neck and neck with thieves and murderers-and the race for justice stands to be a photo finish.