London 1881: Bayswater is in the grip of panic as a ruthless murderer prowls the foggy streets of the nation's capital. Residents live in fear, rumors and accusations abound, and vigilante groups patrol by night. It is not of course, a suitable case for a lady detective, but when a friend falls victim to the killer's knife, Frances Doughty cannot help but be drawn into a sinister new case. Myth and reality collide in another thrilling mystery, and Frances must untangle the truth from the lies in order to solve her most difficult case to date.