Two women at opposite ends of the social scale, both brutally murdered.

Principal Officer Dan Foster of the Bow Street Runners is surprised when his old rival John Townsend requests his help to investigate the murder of Louise Parmeter, a beautiful writer who once shared the bed of the Prince of Wales. Her jewellery is missing, savagely torn from her body. Her memoirs, which threaten to expose the indiscretions of the great and the good, are also missing.

Frustrated by the chief magistrate's demand that he drop his investigation into the death of the unknown beggar woman, found savagely raped and beaten and left to die in the outhouse of a Holborn tavern, Dan is determined to get to the bottom of both murders. But as his enquiries take him into both the richest and the foulest places in London, and Townsend's real reason for requesting his help gradually becomes clear, Dan is forced to face a shocking new reality when the people he loves are targeted by a shadowy and merciless adversary.

The investigation has suddenly got personal.