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! Used with permission from Random House.
Magic Tree House Series, Book 39: Dark Day in the Deep Sea
For more fun facts behind the fiction, don't miss the Magic Tree House Research Guides! The Research Guides provide information about the times, places, and cultures Jack and Annie visit on their Magic Tree House adventures. For this title, see Magic Tree House Research Guide #17: Seamonsters.