Richard Mayhew's life is forever changed after he rescues a young girl named Door and finds himself living in a city of monsters, saints, murderers, and angels, and he must help Door on her mission to save this strange underworld kingdom from destruction.

Richard Mayhew's life is forever changed after he rescues a young girl named Door and finds himself living in a city of monsters, saints, murderers, and angels, and he must help Door on her mission to save this strange underworld kingdom from destruction.