Eight-year-old Jack and his younger sister Annie find a magic treehouse. Each book in the collection takes them to different places.

"Andy and Terry live in a 169-story treehouse...It now has a kangaroo-riding range, a Whatever-Weather-You-Want dome, and a hall of fun-house mirrors--the perfect place to hide from the truancy officer who is trying to catch them and Jill and make them go to school! Unfortunately, the hall of fun-house mirrors is also the place where their evil troublemaking twins, Anti-Andy, Terrible-Terry, and Junkyard-Jill, live in a doppelganger mirror, and they...

Katie Sinclair climbed up a loblolly pine just to see if she could. And then she stayed, creating a media sensation and more than a little trouble for the folks in Jones County, North Carolina. There is a lot of speculation about why the state employee took to the tree. Some think she is making a political statement about the destruction of forests for urban development. Others believe her recent divorce has driven her to a nervous breakdown. But...

Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash.

Andy and Terry recount the story of how they first met, an adventure marked by emergency shark operations, giant storms, and wooden pirate heads.

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. Merlin has asked Jack and Annie to help on another Merlin Mission. This time they head back into history to Venice, Italy, in the 1700s. With the help of some new friends, a research book, and a mysterious rhyme from Merlin, the heroes will save the beautiful city from a flood! Yet another...

Children and their robot friend build a treehouse in a rhyme that fits the tune of "London Bridge is Falling Down." Includes facts about simple machines, jobs robots do, an activity, and musical notation.

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

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

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.