The Sinister Booksellers of BathGarth Nix
The map takes the trio to a place separated from this world, maintained by deadly sorcery performed by an Ancient Sovereign and guarded by monstrous living statues of Purbeck marble. But this is only the beginning, as the booksellers investigate centuries of disappearances and deaths and try to unravel the secrets of the murderous Lady of Stone, a serial killer of awesome powers.
If they do not stop her, she will soon kill again. And this time, her target is not an ordinary mortal.
A wintry return to the somewhat alternate 1980s England of The Left-Handed Booksellers of London.