Publisher's Synopsis
In The 39-Storey Treehouse, Andy and Terry have added thirteen wild new levels to their ever-growing treehouse-including a chocolate waterfall, a dino petting zoo, and the world's scariest roller coaster! But with a book deadline looming, can they focus long enough to finish their fastest book ever? Packed with laughs and zany illustrations, this is the third hilarious adventure in the bestselling series.