Time for the next part of the Tiffany Aching saga. This is book #38: I Shall Wear Midnight.
Following the events of Wintersmith, Tiffany has--say it with me now--attracted the attention of an Eldritch Abomination. This time around, an Entity known simply as The Cunning Man: an Omnian priest in life that was spurned by a witch. Now as an entity can fan the flames of hate in the hearts of people towards witches. Bad news for Tiffany (a witch) and her close affiliates.
©Terry Pratchett