MARY POPE OSBORNE is the author of the New York Times number one bestselling Magic Tree House® series as well as coauthor of the Magic Tree House Fact Tracker series, along with her husband, Will, and her sister, Natalie Pope Boyce.

SAL MURDOCCA has illustrated more than two hundred children’s trade books and textbooks. He is also a librettist for children’s opera, a video artist, an avid runner, a hiker, a bicyclist, and a teacher of children’s illustration at the Parsons School of Design. Sal lives and works in New York with his wife, Nancy.

Travel with Jack and Annie to the deep, dark ocean to encounter the stealthiest of underwater predators: the shark!

When Teddy, a young sorcerer, offers to send Jack and Annie on a dream vacation, they can’t wait to go. The brother-and-sister pair wish for a trip to a beach paradise, and the magic tree house whisks them off to the coast of Mexico. Everything starts out perfectly as they raft around a coral reef. But then a hungry shark attacks! And their dream vacation turns into a nightmare!