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.

While on a mission to prove to Merlin that they can use magic wisely, Jack and Annie travel to seventeenth-century Venice, Italy, to save the city from disaster.

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....

Join Andy and Terry in their now 91-storey spectacular treehouse (It used to be a 78-story treehouse, but they keep getting ideas for more stories!). They've added 13 new levels, including the world's most powerful whirlpool, a mashed-potato-and-gravy train and a human pinball machine. Why not try your luck on the spin-and-win prize wheel or hang out in a giant spider web (with a giant spider), or you can always get your fortune told by Madam Know-it-all...

"Nine long months after being shut out of the pillow fort network for good, Maggie and Abby finally have a whole new mission to focus on--and this one starts with a return to the infamous Camp Cantaloupe. Abby needs this trip after a year of big, BIG changes back at home. But Abby knows that Maggie will never relax until they've solved the lingering puzzle left over from last summer: the mystery of the trap door in Camp Cantaloupe's historic Shipwreck...

Fifth-grader Winnie, with notes from her friends, writes of turning her treehouse into an embassy after her newly-divorced parents become unreasonable, where she is joined by nine others with complaints.

Andy and Terry live in a 156-story treehouse. (It used to be a 143-story treehouse, but they added 13 more levels.) It has a wishing well, a super-stinky stuff level, a bouldering alley (it's just like bowling, except you use boulders instead of balls), an enigma engine, a TV quiz show level hosted by Quizzy the quizzical robot, and the amazing mind-reading sandwich-making machine that knows exactly what sort of sandwich you want and makes it for...

Jack and his younger sister take a trip in their tree house back to ancient Egypt, where they help a queen's mummy continue her voyage to the Next Life.

The magic tree house takes Jack and Annie to Antarctica to search for the fourth secret of happiness for Merlin.

Eight-year-old Jack and his younger sister Annie find a magic treehouse, which whisks them back to an ancient time zone where they see live dinosaurs.