Mary Pope Osborne

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.

The magic tree house carries Jack and Annie to New York City in 1938 on a mission to rescue the last unicorn.

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.

Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy from a spell, Jack and Annie have adventures involving a tiger and other endangered jungle animals.

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
It’s a dream vacation for Jack and Annie—or is it? When Teddy, a young sorcerer, offers to send Jack and Annie on a dream vacation, they can’t wait to go. The brother-and-sister pair wish for a trip to a beach paradise, and the magic tree house whisks them off to the coast of Mexico. Everything starts...

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
Titanic trouble! Jack and Annie are in for an exciting, scary, and sad adventure when the Magic Tree House whisks them back to the decks of the Titanic. Is there anything they can do to help the ill-fated ship? Will they be able to save anyone? Will they be able to save themselves?
Did you know that...

A collection of tall tales about such American folk heroes as Sally Ann Thunder Ann Whirlwind, Pecos Bill, John Henry, and Paul Bunyan.

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
It's sink or swim for Jack and Annie when the Magic Tree House whisks them off to the middle of the ocean. Luckily, they find a mini-submarine on a coral reef. Unluckily, they are about to meet a giant octopus and one very hungry shark. Will the dolphins save the day? Or are Jack and Annie doomed to be dinner?
Did...

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
Have you ever met a real live ninja? Jack and Annie do when the Magic Tree House whisks them back to ancient Japan, where they find themselves in the cave of a ninja master. Will they learn the secrets of the ninja? Or will the evil samurai warriors get them first?
Did you know that there’s a Magic Tree House...

Answers questions about the history and behavior of dogs and provides true stories of dog heroics.