Down the murky alleyways of London, acts of unspeakable wickedness are taking place and the city's vulnerable poor are disappearing from the streets. Out of these shadows comes Hester White, a bright young woman who is desperate to escape the slums by any means possible. When Hester is thrust into the world of the aristocratic Brock family, she leaps at the chance to improve her station in life under the tutelage of the fiercely intelligent and mysterious Rebekah Brock. But whispers from her past slowly begin to poison her new life and both she and Rebekah are lured into the most sinister of investigations, dragging them into the blackest heart of a city where something more depraved than either of them could ever imagine is lurking. . .