Sapphires Are an Earl's Best Friend

Lily Dawson, dubbed the Countess of Charm by the Prince Regent, acts the courtesan while her real purpose is spying for the Crown, to seduce a duke and test his loyalty. She really wants Andrew Booth-Payne, Earl of Darlington — the duke's son. Andrew is furious when he uncovers Lily's mission. His choices are impossible: to betray his family, his country, or his heart.