To root out the card cheat responsible for her brother's death, Miss Delia Trevor spends her evenings dancing her way through high society balls, and her late nights disguised as a young man gambling her way through London's gaming hells. Then one night, handsome Warren Corry, the Marquess of Knightford, a notorious member of St. George's Club, recognizes her. When he threatens to reveal her secret, she's determined to keep him from ruining her plans, even if it means playing a cat-and-mouse game with the enigmatic rakehell.