Mary Pope Osborne

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!!
When Jack and Annie got back from their adventure in Magic Tree House Merlin Mission #20: A Perfect Time for Pandas they had lots of questions. What do pandas eat? Where do they live? Why are snow leopards so scarce?...

The magic tree house takes Jack and his sister Annie to the Great Plains, where they learn about the life of the Lakota Indians.

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.

Jack and Annie ride a tree house to the Amazon rain forest where they encounter flesh-eating piranhas, hungry crocodiles, and wild jaguars.

Magic tree house series, #26. The magic tree house takes Jack and Annie to an African rain forest, where the siblings encounter gorillas and learn to communicate with them.

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

The magic tree house takes Jack and Annie back in time to feudal Japan where the siblings learn about the ways of the Ninja.

The magic tree house takes Jack and Annie to Africa where they meet up with wonderful wild animals, a very hungry warrior, and where they even solve a riddle.

Magic tree house series, #4. The magic tree house whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.