Suddenly, they see another fin in the water. A blue fin. It is a dolphin! It is the beautiful, blue dolphin. The dolphin is swimming towards the shark. The dolphin hits the shark. (p. 14) Did you have a chance to meet dolphins? Probably, most people meet them at an aquarium. Perhaps, some people see them in the sea. In my cases, I saw them with my grandmother when I was a elementary school student. In this book, the main characters are Jen and Rick who is Jen's boyfriend. One day, they were on the beach but Rick went surfing and Jen went swimming underwater. When she was swimming there, she found a lot of plants and fish. However, she found a creature, too. It was a dolphin! It couldn't swim because the net caught it. So, she helped it. As a result, it could swim again. Next day everyone swam on the beach, but suddenly, a shark showed up. Unfortunately, Jen and Rick didn't still escape from the shark. What will become of them? This book is in the