After a break from their trips in the tree house, Jack and Annie are delighted to find that it's back! Morgan le Fay needs their help, but they'll have to become Master Librarians first, and that means solving four riddles. Jack and Annie ride in a mini-sub and meet jellyfish, sea horses and an octopus.
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‘Magic Tree House 9: Diving with Dolphins - Osborne, Mary Pope’.
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