Mary Pope Osborne
Summary: 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 themselves! The brother and sister team are soon rescued by a ship of explorers and scientists. But the crew isn't looking for the secrets of happiness. The crew is looking for . . . a sea monster! From the Hardcover edition.
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Annie's brother; at a deserted island looking for the third secret of happiness.
Jack's sister; at a deserted island looking for the third secret of happiness.