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.

This time, meet famous explorer Leif Erikson and help save a narwhal! When the magic tree house whisks Jack and Annie to Greenland, they're not sure what time they've landed in, but they immediately know what their mission is: save a narwhal! Then, they meet a young hunter named Leif Erikson, and they ask for his help. But Leif has other ideas.

When Andy develops a severe toothache that prevents him from writing new jokes for their book, Terry uses their fantastical treehouse's money-making machine funds to purchase a Joke Writer 2000, with unexpected results.

"Join Jack and Annie as they as they meet one of the world's most famous illusionists - Harry Houdini!"--

Who wouldn't want to live in a treehouse? Especially a 13-story treehouse that has a bowling alley, a see-through swimming pool, a tank full of sharks, a library full of comics, a secret underground laboratory, a games room, self-making beds, vines you can swing on, a vegetable vaporiser and a marshmallow machine that follows you around and automatically shoots your favorite flavored marshmallows into your mouth whenever it discerns you're hungry....

Join Andy and Terry in their now 91-storey spectacular treehouse. They've added thirteen new levels, including the world's most powerful whirlpool, a mashed-potato-and-gravy train and a human pinball machine. Why not try your luck on the spin-and-win prize wheel or hang out in a giant spider web (with a giant spider), or you can always get your fortune told by Madam Know-it-all or eat a submarine sandwich the size of an actual submarine while deciding...

Features Jack and Annie back in Egypt, still seeking the secrets of greatness for Merlin. This time they will meet the great nurse, Florence Nightingale, on her trip to Egypt that served as the inspiration for the choices that made her both famous and beloved. Features Jack and Annie and legendary magician, Harry Houdini.

Dragon of the red dawn: When Merlin is weighed down by sorrows, the enchantress Morgan asks Jack and Annie of Frog Creek, Pennsylvania, to use their tree house to travel to a land of fierce samurai and great beauty, in the capital city of Edo (now the city of Tokyo) in old Japan in the 1600s to learn one of the four secrets of happiness. Blizzard of the blue moon: Jack and Annie go back in time to New York City, during one of the darkest periods...

"The magic tree house whisks Jack and Annie to Africa where they must use magic to save a rhino and her baby from poachers"--