Lord Morgan Easton is, first and foremost, an agent of the Crown. To achieve his purposes, he has become Society's golden boy, and a renowned rake. When it's discovered that notorious French spy, Genet, is attending a house party in a small seaside village, he is tasked to infiltrate the gathering and arrest the spy. But first, he must convince a certain woman to become his partner and pose as his wife. The challenge is that she would rather see him dead.

Miss Josette Northcott guards her secrets fiercely, trusts few, and enjoys the anonymity that goes along with being the headmistress of a private school in the rookeries. When Lord Morgan offers her a deal she can't refuse, she makes it clear that this is nothing more than a business arrangement. No man, no matter how charming or infuriatingly handsome he is, can know the truth of her sordid and twisted past.

As a nefarious plot begins to unfold, threatening the stability of two countries, Morgan and Josette must learn to trust each other in order to stop the assassination of both the King of France and their own prince regent. However, trust does not come easily to either agent, and when the truth of Josette's past is finally unveiled, will they be able to accept that not only is their mission on the line, but their hearts, as well?