In Shadow of the Shark by Mary Pope Osborne, Jack and Annie are going on vacation! Or so they think. Teddy, the young sorcerer, has promised them a relaxing time off the coast of Mexico. The magic tree house whisks them away to a beautiful sandy beach, and Jack and Annie are ready to raft on the ocean waves. But when a hungry shark attacks, their dream vacation turns into a nightmare! Recommended for ages 7 to 10 years.