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.。现在的楚阳，在他的眼中，绝对绝对，就是魔鬼的化身！比死神要恐怖得多！作为刀头舔血的江湖人，刑讯逼供他见得多了，但如此干净利落，丝毫不拖泥带水，似乎是完全以残虐为乐而绝不是为了问出什么东西的审讯，他还是……