The Spook and his apprentice, Thomas Ward, have returned to the county after a long journey and a hard battle. But their troubles are far from over. Their home has been over-run by enemy soldiers. The Spook's house is in ruins, the boggart protecting it has fled, and the malicious witches imprisoned in the gardens have escaped. Tom, Alice, and the Spook must flee, too, across the ocean to the island of Mona. And it's on Mona that this small band fighting against the dark will face an old enemy grown terrifyingly powerful.

Thomas Ward is the apprentice for the local Spook, who banishes boggarts and drives away ghosts. But now a new danger is threatening Tom's world: the witches are rising and the three most powerful clans are uniting in order to conjure an unimaginable evil. Tom and the Spook set out to stop the witches before they unleash the demon. But when Tom finds himself on his own, he wonders if he has the courage and cunning to defeat the most powerful enemy he has ever encountered.

Thomas Ward is the apprentice for the local Spook, who captures witches and drives away ghosts. As the weather gets colder and the nights draw in, the Spook receives an unexpected visitor. Tom doesn't know who the stranger is or what he wants, but the Spook suddenly decides it's time to travel to his winter house, Anglezarke. Tom has heard it will be a bleak, forbidding place, and that menacing creatures are starting to stir somewhere on the moors nearby.

The Spook and his apprentice, Thomas Ward, deal with the dark. Together they rid the county of witches, ghosts, and boggarts. But now there's some unfinished business to attend to in Priestown. Deep in the catacombs of the cathedral lurks a creature the Spook has never been able to defeat, a force so evil that the whole county is in danger of being corrupted by its powers. The Bane!

Only Thomas Ward is left. He's the last hope; the last apprentice. Can Thomas succeed? Will he learn the difference between a benign witch and a malevolent one? Does the Spook's warning against girls with pointy shoes include Alice? And what will happen if Thomas accidentally frees Mother Malkin, the most evil witch in the county?