Пратчетт Терри: Witches Abroad

One of the Discworld novels. The witches Granny Weatherwax, Nanny Ogg and Magrat Garlick travel to the distant city of Genua to make sure that a servant girl doesnt marry a prince. But all theyve got is Mrs Gogols voodoo, a one-eyed cat and a secondhand magic wand that can only do pumpkins.