Laugh-out-loud wacky adventures in the world''s most awesome treehouse! There are numerous instalments in this hilarious and highly illustrated series. For fans of Captain Underpants and Diary of a Wimpy Kid . The first is The 13-Storey Treehouse and you can follow up the fun in The 26-Storey Treehouse, The 39-Storey Treehouse, The 52-Storey Treehouse, The 65-Storey Treehouse, The 78-Storey Treehouse and The 91-Storey Treehouse . You can also find activities, games and treehouse trivia in The Treehouse Fun Book . Well, what are you waiting for? Come on up!