The fourth installment in Willig’s Pink Carnation series finds beautiful, ambitious Mary Allsworthy still smarting from her sister Letty’s inadvertent theft of her suitor in The Deception of the Emerald Ring (2007). At the suggestion of the Pink Carnation, the imperious Lord Vaughn recruits Mary to help him uncover the identity of the Black Tulip, a French spy who threatens England’s interests....