The Magic Tree House series is an award-winning series of children's books written by American author Mary Pope Osborne.In the first series, consisting of the first 28 books, Morgan le Fay sends Jack and Annie, two normal children from Frog Creek, Pennsylvania, on numerous adventures and missions with a magical tree house in order to help free Morgan from a spell, solve four ancient riddles to become Master Librarians, and save four ancient stories from being lost forever. After the twenty-eighth chapter book, Mary Pope Osborne started a second series called the Magic Tree House 'Merlin Missions'. In these missions, Jack and Annie have quests from the ancient wizard Merlin the Magician. These books are longer than the previous 28, and some take place in fantasy realms like Camelot.
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