The Home Office has asked Sir Bertrand Thorndike to head an investigation into stolen royal jewels. It's the perfect chance for Bertie to step out of his brother's long shadow. His superior, The Duke of Haverly, has a plan that makes him balk: in order to sell his cover, Bertie must play the part of a man looking for love, ready to reform his rakish ways. The duke is willing to let Bertie name his own investigative team, but his recommendation that the team include Philippa Cashel has Bertie on his guard. Does the duke—known for his behind-the-scenes machinations—have an ulterior motive?

Philippa Cashel escaped her life as one of society's best-known courtesans, devoting her life to helping other women in dire straits. So when Sir Bertrand Thorndike approaches her about joining his team as an agent of the Crown, she is skeptical. She's focused on getting her school for underprivileged women up and running, not in cloak-and-dagger skullduggery. Her hope is that if she labors hard enough at her charity work, she might begin to feel worthy of God's forgiveness. When one of Philippa's rescued girls is arrested for stealing the royal jewels and another is murdered, Philippa will risk partnering with Bertie to find the loot and stop the killer. Two brilliant minds—with two wary hearts—and one cunning deceiver are on a collision course in Regency England.