When eight-year-old Jack and his seven-year-old sister, Annie, travel in the magic treehouse to join a group of nineteenth-century explorers aboard the H.M.S. Challenger, they learn about the ocean, solve the mystery of its fabled sea monster, and gain compassion for their fellow creatures.

"Includes brand-new full color illustrations! Celebrate Christmas with Jack, Annie, and the Magic Tree House with this oversized, gorgeously illustrated deluxe holiday edition from the #1 bestselling chapter book series. When Jack and Annie receive an invitation to spend Christmas Eve in Camelot--a magical place that exists only in myth and fantasy--they know they are in for their biggest adventure yet. What they don't know is that the invitation...

When Merlin is weighed down by sorrows, Jack and Annie use the magic treehouse to travel back to feudal Japan to learn one of the four secrets of happiness.

"Jack and Annie travel back in time to 1925 Nome, Alaska, where they meet Balto, the famous sled dog, and help save the town from illness"--

Guided by a magic rhyme, Jack and Annie travel in the magic treehouse to ancient Baghdad on a mission to help the Caliph disseminate wisdom to the world.

Traveling in the magic treehouse, Jack and Annie visit the Paris World's Fair of 1889 in an effort to protect four scientific pioneers from an evil sorcerer.

The magic treehouse transports Jack and Annie to southwest China to find the final object needed to break the spell on the wizard Merlin's beloved penguin, and while there they take a side trip to the world's largest giant panda reserve.

Using the magic treehouse, Jack and Annie travel back to nineteenth-century Ireland to inspire a young Augusta Gregory to share her love of Irish legends and folktales with the world.

Jack and Annie are whisked back in time in the magic treehouse to Mexico City for the 1970 World Cup. They are sure the famous soccer player Pelé will be the one to tell them a secret of greatness, which they need for Merlin the magician. But the stands are packed, and when the game ends, Jack and Annie have to find Pelé! How will they discover the secret of greatness in a crowd of 100,000 fans?

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