When Peter and his friend Festival destroyed the book called How to Live Forever so it could no longer work its terrible spell, they didn't know that destroying such a powerful book would have unintended consequences. Now, the world is in the worst drought ever - major rivers dried up, and water rationed to a single litre per person a day with talk of less. Festival comes back from the world inside the museum to get Peter. The river they reversed is drowning Festival's world and they need to re-create the book to reverse the water flow. Neither can remember all of the book, but hopefully by working together they will be able to recall every word. Can they reverse the water flow so that it rains in Peter's world again? And if they recreate the evil book, can they entomb it so that it can never been accessed again?