Fardoor is wonder, it is beauty, it is magic. Fardoor is curiosity and danger. Fardoor is not our world. The Day children and their cousin Will find a way in to Fardoor long after it had been forgotten. Will is left behind. Lost in a world where cities move on clouds and forest sprites hide in every tree, he quickly unleashes a dark force that threatens both Fardoor and himself. Now it's up to Thomas and Rebecca to navigate this unusual world, learn its magic, and get their cousin back. That is, if he wants to return home at all.