Jack and Annie are ready for their next fantasy adventure in the bestselling middle-grade series—the Magic Tree House!<br> <br> IT'S SINK OR SWIM<br><br>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. <i>Unluckily</i>, 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?<br> <br> Visit the Magic Tree House website!<br> MagicTreeHouse.com