Carpe Jugulum: 07/12/14
Carpe Jugulum by Terry Pratchett is is the 23rd Discworld book and the sixth (if I'm counting right) of the Witch books. It's also, I think, the introduction of the Nac Mac Feegles, and coincidently, the clan who end up proving the new Kelder for Rob Anybody's clan.
OK, I admit to reading it mostly for the Feegles, but the actual "stars" of the book are a family of vampires that have decided to invade Lancre through their use of glamor. What they weren't expecting, though, was a coven of witches with close ties to the king and queen — the queen being Magrat, a former member of said coven.
It's a very short, silly book on the surface. But when the sophomoric jokes are set aside, there are some deep observations about feminism and the human condition in there. This book especially (and probably because of the Feegles) has some grains of thought that are allowed to ripen in the Tiffany Aching books.