A wizard squared, a wellspring of magic, is born as the eighth son of an eighth son. A sourcer. The Discworld's finest magical institution, Unseen University, has finally gotten its wish: the emergence of a wizard more powerful than ever before. You'd think they'd be a little more careful about what they wished for... As the sourcerer seizes control of the University and sets his sights on the rest of the world, just one wizard remains unaffected. Rincewind, unfortunately for everyone. Once again, the cowardly wizard must set out on a quest: to transport a valuable artefact - the very incarnation of magic itself - halfway across the Disc to safety. If he does not survive, all wizardry will perish. And the end of the world, depending on who you listen to.