He had a perfectly orderly life... William, the sixth Duke of Pelham, enjoys his punctual, securely structured life. Orderly and predictable—that's the way he likes it. But he's in the public eye, and the scandal sheets will make up anything to sell papers. When the gossip papers link him to Juliette, one of the most beautiful and celebrated courtesans in London, chaos doesn't begin to describe what happens next... Until she came along... Juliette is nicknamed the Duchess of Dalliance and has the cream of the nobility at her beck and call. It's disruptive to have the duke who is the biggest catch on the Marriage Mart scaring her other suitors away. Then she discovers William's darkest secret and decides what he needs in his life is the kind of excitement only she can provide...

Fallon, the Marchioness of Mystery, is a celebrated courtesan with a mysterious past. Warrick Fitzhugh will do anything to protect his compatriots in the Foreign Office, including seduce Fallon, who he thinks can lead him to the deadliest crime lord in London. Fallon is not who Warrick thinks she is, but her secrets answer his desire.

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.