Unlike most bluestockings, Lady Madeline Mulbourne is quite content for the ton to dismiss her as a widowed baroness and renowned hostess of society parties. No need for anyone to know that her flighty manner disguises an encyclopedic knowledge of art, a bone-deep distrust of men, and a dangerous secret.

Lord Arthur Carmichael, Marquess of Bancroft, has carefully cultivated a wild reputation. What could be a more perfect cover for the spy missions he undertook for the Crown? Unfortunately now that the war has ended, his reputation could keep him from settling into a cabinet position—unless he takes a wife.

Before Arthur can embark on the dreaded wedding quest, he must complete one last mission: catch a thief who’s stolen four of five priceless pieces of jewelry. If the last one disappears, the fragile peace between France and England could be damaged beyond repair.

Whom should he encounter on the French Riviera but Lady Mulbourne, who never forgave him for vanishing during their long-ago courtship. Arthur suspects her nimble fingers are adept at more than just fluttering a fan, because he knows of one item she’s already stolen: his heart.