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 Washington D.C. in the 1860s where they meet Abraham Lincoln and collect a feather that will help break a magic spell.

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

Jack and Annie travel to a monastery in the Swiss Alps where, with the help of St. Bernard dogs and magic, they seek the second of four special objects necessary to break the spell on the wizard Merlin's beloved penguin, Penny.

"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"-- Provided by publisher.

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

Travel to Ancient Greece with Jack and Annie as they meet Alexander the Great and help tame his wild stallion.

While on a mission to prove to Merlin that they can use magic wisely, Jack and Annie travel to seventeenth-century Venice, Italy, to save the city from disaster.

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 travel to Vienna, Austria, in 1762 where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.