The last time we saw the Witches, they were ushering off their third member into the perils of marriage, and to a King, no less. Anyway, Magrat’s gone now, and things are going funny without a third to balance things out. Nanny Ogg in particular is worried about Granny Weatherwax, who is terrifying under the best of circumstances. They take a trip to Ankh-Morpork after Granny learns that Nanny wrote a book that is a bestseller, but has gotten no royalties from the swindling publisher. […]