Osborne, Mary Pope creator United States of America 1st. ed. 80 p. 9 x 0.38 x 7.63 inches It's sink or swim for Jack and Annie when the Magic Tree House whisks them off to the middle of the ocean. Luckily, they find a mini-submarine on a coral reef. Unluckily, they are about to meet a giant octopus and one very hungry shark. Will the dolphins save the day? Or are Jack and Annie doomed to be dinner? Children's Literature Imagination Action or Adventure Time Travel Teamwork 9780679883388 120065