某个炎热的夏天午后，8岁的Jack和他7岁的妹妹Annie在森林中发现一个奇怪的树屋，当他们好奇地爬上树屋之后，惊讶的发现其中居然有各式各样的藏书…他们很快地发现这是一个具有魔法的树屋，只要用手一指，神奇的魔法就会帶他们到书中的地方去，他们穿越了时空，橫跨过去与未来，从古埃及到外太空，遇上了恐龙、木乃伊与海盜，发生了许多新鲜惊奇的冒险大小事。 这些好玩又有趣的故事全部都在Magic Tree House系列故事读本，本书是Magic Tree House系列中的一册，小朋友可一起來随着作者生动的笔触，发挥想像力，加入Jack & Annie 的探险行列 !

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?You'll have fun findinq out in...

1. Master Librarians

2. The Reef

3. Mini-Sub

4. Fish City

5. Two Eyes

6. C-R-A-C-K

7. Remain Calm

8. Swim for Your Life!

9. Ouch!

10. The True Pearl