Lucia’s fingers found her own. She gazed at Caro as if from a distance. Her lips parted, her words a whisper: ‘He knows.’ London, 1782. Desperate for her politician husband to return home from France, Caroline 'Caro' Corsham is already in a state of anxiety when she finds a well-dressed woman mortally wounded in the bowers of the Vauxhall Pleasure Gardens. The Bow Street constables are swift to act, until they discover that the deceased woman was a highly paid prostitute, at which point they cease to care entirely. But Caro has motives of her own for wanting to see justice done, and so sets out to solve the crime herself. Enlisting the help of thieftaker, Peregrine Child, their inquiry delves into the hidden corners of Georgian society, a world of artifice, deception and secret lives. But with many gentlemen refusing to speak about their dealings with the dead woman and Caro's own reputation under threat, finding the killer will be harder and more treacherous than she can know …