Dark Days in the Deap Sea Magic Tree House #39 Author: Mary Pope Osborne
	Book Information Publisher: Scholastic Book Type: Paperback Rating: 1 ISBN-13: 9780545202145 - ISBN-10: 0545202140 Publication Date: 4/28/2009

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 that isn’t the end of their troubles, because the crew isn’t looking for the secrets of happiness. The crew is looking for . . . a sea monster!