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.