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

A castle looms dark against the light of the moon. No candles burn in its windows. No laughter rings through its halls. What has happened to the castle and the people who lived there? Merlin the magician asks Jack and Annie to find out. But are they brave enough to step through the creeking doors and solve the mystery of how the castle became haunted?

Jack and Annie are joined by Teddy and Kathleen as they travel to the snowy Land-Behind-the-Clouds, where they search for the eye of the Ice Wizard and attempt to help Merlin and Morgan.

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.

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

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.

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

Magically transported to southwest China to find the final object needed to break the spell on the wizard Merlin's beloved penguin, Jack and Annie take a side trip to the world's largest giant panda reserve.

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.

Jack and Annie travel back to Victorian London when Merlin asks them to use their magic to inspire Charles Dickens to write "A Christmas Carol."