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Jump into book #39!! History, mystery, and magic!! Jack and Annie continue their quest for the secrets of happiness— secrets they need if they’re going to save Merlin. But when the magic tree house leads them to a tiny deserted island in the middle of the ocean, they’re not sure who needs help more—Merlin, or them!! The two are soon rescued by a ship full of explorers and the scientists. But the crew isn’t looking for a … sea monster!! Will Jack and Annie wind up in the monsters clutches?