A tree, timber, tools, a rope of twisted twine all all things you need to build a treehouse--but most of all you need time and imagination.

Andy and Terry live in a 78-story treehouse. (It used to be a 65-story treehouse, but they just keep building more levels!) It has a drive-thru car wash, a courtroom with a robot judge called Edward Gavelhead, a scribbletorium, a combining machine, an ALL-BALL sports stadium, a high-security potato chip storage facility, and an open-air movie theatre with a super-giant screen . . . which is a very useful thing to have now that Terry's going to be...

Who wouldn't want to live in a treehouse? Especially a 13-story treehouse that has a bowling alley, a see-through swimming pool, a tank full of sharks, a library full of comics, a secret underground laboratory, a games room, self-making beds, vines you can swing on, a vegetable vaporiser and a marshmallow machine that follows you around and automatically shoots your favourite flavoured marshmallows into your mouth whenever it discerns you're hungry....

Andy and Terry travel through time trying to save their treehouse from highly talented, angry ants and Inspector Bubblewrap the building inspector while rushing to meet their publisher's deadline.

Froggy and his friends build a treehouse, while avoiding help from his little sister, Frogilina.

"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...

Their magic tree house takes Jack and Annie back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.

A sequel to The 13-Story Treehouse finds Andy and Terry recounting the story of how they first met, an adventure marked by emergency shark operations, giant storms and wooden pirate heads.

Because she is getting bigger, Audrey decides she needs a new house, so her father builds her a tree-house of her own.

Their magic tree house takes Jack and Annie to the Arctic, where a polar bear leads them onto very thin ice.