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 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...

Jack and Annie experience a series of time-travel adventures.

When strange noises are heard in the tree house where their club meets, Claire and Kaz wonder if a rival club is causing problems in order to scare them away, or if they are coming from the ghosts of one of Kaz's departed ancestors.

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.

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.

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.

The magic tree house whisks Jack and Annie back to ancient Ireland to find a special book. There they meet monks who have spent their lives making beautiful books. Then fierce Vikings raid the coast!

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle. Morgan le Fay will make Jack and Annie masters of the tree house if only they can solve four riddles -- which will take four books, of course! Dolphins at Daybreak begins the third set of four books in this magical (and increasingly popular) series! Jack and Annie are off in the Magic...

A prince planning a feast in his castle and a pirate preparing her ship for a treasure hunt clash after learning they share a fort, but soon imagine a new adventure for two.