This book is one of "e;White Whale Original Fantasy Children's Literature Excellent Work"e; and is a children's literature work suitable for children. The story tells of a 10-year-old Ling Bo who is involved in a child missing case which has not been solved for many years. When he learned that the murderer controlled everything through the submarine cable, he and his teacher fought bravely at the bottom of the sea and finally defeated the murderer.