After the events in “Rinswind’s Nemesis Games,” Rinswind and Twoflower are once again back on the solid ground of the Disc, in the magical forest of talking trees, where they meet leprechauns. But they can’t rest or relax. A Crimson Star is approaching the Planet, one capable of completely swallowing the Disc. Only a mysterious spell can save a small piece of the universe, but it is in Rinswind’s head—and now he himself is in danger. Too many people want to kill the unfortunate wizard and get access to the spell hidden inside his consciousness.