Slither lurks in woods and towns, hunting for human blood, but before he can feast on three lovely sisters, their dying father binds the monster to a bargain.

In his job as the county's spook, seventeen-year-old Thomas Ward is used to battling boggarts, witches, and other creatures of the dark. But now he and his apprentice, Jenny, must team up with former rivals and enemies to fight the evil Kobalos warriors intent on destroying the county. The fight has cost the life of a strong ally, Grimalkin the witch assassin. Determined to end the war with the demons, Tom leads Jenny and Alice to Pendle for one last...