Jack and Annie must find the four things that will free an enchanted dog named Teddy from a spell. Their quest leads them to a ship lost at sea, the Great Plains, the forests of India, and the Australian Outback. It’s a difficult and dangerous mission, but Jack and Annie will do anything to help their new friend, Teddy! Books in this set include: (#17), (#18), (#19), and (#20). Did you know that there’s a Magic Tree House book for every kid? Merlin Missions: More challenging adventures for the experienced reader Super Edition: A longer and more dangerous adventure Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures