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. As determined as Mary is to find a husband, Lord Vaughn, a widower, is equally determined not to succumb to her charms, creating a palpable friction between the two. The closer they get to their goal of finding the Black Tulip, the more their adversarial feelings dissolve into attraction, even love, just as a secret from Vaughn’s past threatens to keep them apart forever. In the present, graduate student Eloise Kelly delves deeper into the archival papers to discover the Black Tulip’s identity. Willig’s series gets better with each addition, and her latest is filled with swashbuckling fun, romance, and intrigue.