The 117-Storey Treehouse
The ninth book in the Treehouse series.
Andy and Terry have added another thirteen levels of crazy fun to their every-growing treehouse. They've got a tiny-horse level, a pyjama-party room, an Underpants Museum and Treehouse Information Centre! But Andy and Terry have found themselves running from the Story Police and the only way to escape, is through the terrifying Door of Doom!