According to the Discworld reading order guide (v3.0), Witches Abroad! is the third book in the Witches thread of Discworld books.
Terry Pratchett – Witches Abroad! (1991)
(Discworld #12, Discworld – Witches Series #3) 🎧
It seemed an easy job… After all, how difficult could it be to make sure that a servant girl doesn’t marry a prince? Quite hard, actually, even for the witches Granny Weatherwax, Nanny Ogg and Magrat Garlick. That’s the problem with real life – it tends to get in the way of a good story, and a good story is hard to resist. Servant girls have to marry the prince. That’s what life is all about. You can’t fight a Happy Ending, especially when it comes with glass slippers and a Fairy Godmother who has made Destiny an offer it can’t refuse.
At least – up until now…
Note 1: 🎧 the unabridged audiobook for Witches Abroad! is narrated by Nigel Planer, 🎧 the abridged audiobook for Witches Abroad! is narrated by Tony Robinson.
❝The only way housework could be done in this place was with a shovel or, for preference, a match.❞
❝Racism was not a problem on the Discworld, because — what with trolls and dwarfs and so on — speciesism was more interesting. Black and white lived in perfect harmony and ganged up on green.❞
❝The maiden, the mother and the… other one.❞
❝”You can’t go around building a better world for people. Only people can build a better world for people. Otherwise it’s just a cage.”❞
❝Greebo’s technique was unscientific and wouldn’t have stood a chance against any decent swordmanship, but on his side was the fact that it is almost impossible to develop decent swordmanship when you seem to have run into a food mixer that is biting your ear off.❞
 The Annotated Pratchett File v9.0 – Witches Abroad
 Witches Abroad (From Wikipedia, the free encyclopedia)