Isla and her brother are two young foxes living just outside a human city, but one night Isla returns to her den to find it destroyed, and surrounded by strange, vicious foxes, so she takes refuge in the city while she masters foxcraft, the ancient magical arts of her kind.

Andy and Terry are once again inviting readers to come hang out with them in their astonishing 39-story treehouse (it used to be 13 stories, then 26 stories, but they keep expanding). And this year they will have even more time to jump on the world's highest trampoline, toast marshmallows in an active volcano, swim in the chocolate waterfall, pet baby dinosaurs, and go head-to-trunk with the Trunkinator, since Terry has created the greatest invention...