This is a new story about a mermaid. Dr. White has to play dead when he finds out the scheme of Prince Adam but cannot expose it. He leaves the clues on his will for his adopted granddaughter Milu whom he has met only once and hopes that she can discover the sinful laboratory through the zoo. The mermaid gets Milu involved in the royal rivalry. Prince Adam produces strong hybrids combining humans with animals through zoopery so that he can establish his army and seize power. Milu and Shemin work together and have a showdown with the evil man who has controlled the mermaid. At last Milu saves the zoo and becomes the heiress after she undergoes difficulties.