I Shall Wear Midnight: Terry Pratchett

The fourth book in the Tiffany Aching series - five Discworld novels by master-storyteller Terry Pratchett.
Tiffany Aching is a witch alone.
Well, that`s how she feels. Everyone seems so, apart. People respect her, but also fear her. There are loads of secrets she can`t share.
And when the Baron dies, and Tiffany is framed for his murder, it`s clearer than ever that she is, well . . . not liked
Now Tiffany must journey to Ankh-Morpork, to inform the Baron`s heir, Roland, of his father`s death. But on the way she meets something that likes witches very much . . . a bit too much - an evil ball of spite and malice that has only now woken up.
And is out to get witches everywhere . . .