The book begins shortly after the ending of "The Colour of Magic", with wizard Rincewind, Twoflower and the Luggage falling from the Discworld. They are saved when the Octavo, the most powerful book of magic on the Discworld, readjusts reality to prevent the loss of one of its eight spells, which has resided in Rincewind's head since his expulsion from Unseen University: Rincewind, Twoflower and the Luggage end up in the Forest of Skund. Meanwhile, the wizards of Ankh-Morpork use the Rite of Ashk-Ente to summon Death to find an explanation for the Octavo's actions. Death warns them that the Discworld will soon be destroyed by a huge red star unless the eight spells of the Octavo are read.