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 dolphin save the day? Or are Jack and Annie doomed to be dinner?
You'll have fun finding it out in ...
Magic Tree House # 9: Magic at Daybreak