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 live in a 143-story treehouse. (It used to be a 130-story treehouse, but they built another thirteen stories.) Andy's been a bit stressed out lately, so Terry decides the perfect way to relax would be to head up to their new camping groundlevel for a much-needed vacation. But it turns out to be not quite as relaxing as planned. Terry forgets to pack the tent and the food, their attempt at fishing ends in disaster, the spooky campfire...

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

When Andy develops a severe toothache that prevents him from writing new jokes for their book, Terry uses their fantastical treehouse's money-making machine funds to purchase a Joke Writer 2000, with unexpected results.

Haunted castle on Hallow's Eve: Jack and Annie have their second Merlin mission. Merlin, the magician wants to know how the castle became haunted, and he wants to return the castle to its rightful owners. Summer of the sea serpent: Jack and Annie have another mission from Merlin the magician. This time the adventure includes underwater caves, a magical sword, a Spider Queen and mystical selkies. Winter of the Ice Wizard: The Ice Wizard has captured...

Jack and Annie travel in their magic tree house to Elizabethan London, where they become actors in a production of A Midsummer Night's Dream and try to rescue a tame bear.

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.

When Jack and Annie travel back to the Kansas prairie in search of "something to learn," they gain an understanding of how hard life was for pioneers and they experience the terror of a tornado.

Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.

"With ladders, swings, turrets, and elaborate pulley systems everywhere--animals chase one another over, under, around, and through the tree house that Jack has built. Then the bell rings, and all the animals gather for story time with Jack"-- Provided by publisher.