Mary Pope Osborne

Merlin the magician send Jack and Annie back 1,200 years, to a desert in the Golden Age of Baghdad. Their mission is a mystery until bandits attack a camel caravan and Jack and Annie are given a strange box to protect. What's in the box? And how will it help the ruler of Baghdad spread wisdom throughout the world?

The magic tree house whisks Jack and Annie to India during the Mogul Empire in the 1600s to search for an emerald needed to break a magic spell.

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

Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.

"Merlin the magician and Morgan le Fay have mysteriously disappeared! To find them, Jack and Annie journey with their friends Teddy and Kathleen to a frozen kingdom of ice and snow. There they must go on a mission for the one-eyed Ice Wizard. Chased by wolves and braving terrible storms, they have only two things to help them - a magic rope and the Ice Wizard's strange rhyme: Take my sleigh And find your way To the House of the Norns In the curve...

Join Jack and Annie as they research Leonardo da Vinci and find out the facts behind the fiction.

Their magic tree house takes Jack and Annie to the Arctic, where a polar bear leads them onto very thin ice.

The magic treehouse takes Jack and Annie back two thousand years to ancient China where they must find the original copy of an old legend before the Imperial Library is burned down by the evil Dragon King.

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.

Tells of the heroic deeds of the legendary New York firefighter, Mose Humphreys.