London 1667. Acclaimed beauty and singer Harriet Gow is the star performer at the famous Theatre Royal on Drury Lane, as well as the favourite mistress of King Charles II. After seeing her perform, Christopher Redmayne is likewise captivated so he is intrigued when the King urgently summons him - it seems Harriet has been kidnapped. Redmayne, with the help of his friend Jonathan Bale is engaged to resolve this delicate affair and they quickly begin delving into Harriet's background. The façade of elegance soon begins to crumble in the face of their investigations, and just as Redmayne and Bale start to question whether Harriet is really the victim or the guilty party, a brutal murder provides the answer...