As the weather gets colder, the Spook announces that it's time to move to his winter home on Anglezarke - a bleak, forbidding place, close to the dark with a deep cellar full of bound witches and boggarts. Once there, Tom finds himself discovering more and more about his master's past and the identity of a mysterious visitor who, it seems, is the Spook's sworn enemy. Is the Spook's past catching up with him? And how much danger will Tom be in if his master's secrets are revealed?