Product Description: 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! Product Details: Age Range: 6 - 9 Grade Level: 1 ? 4 Series: Magic Tree House [Book #39] Paperback: 144 pages Publisher: Random House Books for Young Readers; (April 28, 2009) Language: English ISBN-10: 0375837319 ISBN-13: 978-0375837319 Condition: New Retail Price: $11.99 USD Feel free to email us if there are any questions. Thanks for looking! Come see our other items! Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items.