Haunted Castle on Hallow's Eve
The castle looms dark against the light of the moon. Merlin the magician needs someone smart enough to solve the mystery of how the castle became haunted and return it to its rightful owners—so Jack and Annie take on their second Merlin mission in the magical realm of Camelot.

Summer of the Sea Serpent
Jack and Annie are off on another mythical mission at the request of Merlin...

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.

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
Merlin’s beloved penguin, Penny, has been put under a spell! To save her, Jack and Annie must find a rare and precious emerald. When the magic tree house whisks them back to India over four hundred years ago to search for the jewel, they discover an amazing and exotic world filled with great danger.
Formerly numbered...

Dogs in the Dead of Night
Jack and Annie must find a rare flower to save one of their best friends! So when the magic tree house whisks them back in time to the Swiss Alps, they're confused. How can they find a flower buried under ice and snow? When they find an ancient monastery where monks and St. Bernards live, Annie offers to train a young dog named Barry. Then Barry runs away from the monastery, and Jack and Annie have a new task—find...

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

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!
Hold your horses! Jack and Annie must find four secrets of greatness for Merlin the magician. To start, they travel back in time to meet Alexander the Great. He should know all about greatness, right? But young Alexander is bossy, vain, and not great at all! How can they learn from him? It’s going to take a wild...

As a thank-you from Merlin and Morgan, Jack and Annie are sent on what should be a vacation at a luxurious resort in Cozumel, Mexico, but is, by mistake, an adventure with ancient Mayans, instead.

Magic Tree House is the #1 bestselling chapter book series! In these NEW adventure, Jack and Annie meet Balto, and then return to Camelot!
Balto of the Blue Dawn:
The magic tree house has returned and it's taking Jack and Annie back in time to Alaska, 1925. There they meet Balto, a jet-black Siberian husky destined to save victims of the diphtheria epidemic. But the trail isn't easy, and Balto is going to need Jack and Annie's...

Jack and Annie are sent to 1925 Alaska to help Balto the sled dog save the inhabitants of Nome from a deadly epidemic.