赛伦是生活在小镇上过着普通生活的一个小女孩，在她12岁生日即将到来之时，她的妈妈告诉了她一个秘密：赛伦是一只美人鱼，而且是人鱼公主，到了12岁会变身成美人鱼，必须回到海里生活，此时，一群人鱼猎人得知了这个消息并开始捕捉她...

　　Siren Phillips has lived her life thinking she's an ordinary girl, in an ordinary town. On the eve of her twelfth birthday, however, she learns that she is far from ordinary. Destined to turn in...