Zac is a teenage boy who decides to camp on Mako Island, unaware that three mermaids, Sirena, Nixie and Lyla, who are guardians of the island, are watching him. That night, when the full moon rises, the boy comes into contact with the magic water of the Moon Pool. The following morning, Zac wakes up discovering he has become a merman with a fish-like tail and the ability to control and manipulate water. His new-found merman abilities will cause problems for the mermaids.　　The three mermaids, curious about living on land, are transformed into humans while in the moon pool during a full moon, now having the ability to live like humans.。走出大厅门，老太太摇着头开口了，“苏家如今闹出这种笑话来，也全因为苏扬那小家伙没看准人的缘故。所以呐，咱们小北小倾他们往后找女朋友，都得睁大眼了。那些小户人家的女孩子就不要带回来了，我们燕家可受不住这……