两位胸怀宽广的孟菲斯女子——一位约会教练与一位曾叱咤比尔街的蓝调歌手——在圣诞来临之际意外形单影只。不甘在落寞中度过节日的她们，结下了一段意想不到的友谊，相互扶持着迈向爱情、疗愈与重生之路——这一切都浸润在孟菲斯灵魂乐的韵律之中。

心里阴暗的哈里队长深夜潜入局长办公室，找到了拉萨雷校长年届退休的证据，哈里志满意得，认为这是顶替拉萨雷的绝好机会。另一方面，校长又送走了一批毕业生，在典礼上，官方宣布了拉萨雷即将退休的消息，而一生兢兢业业的校长也得到了在迈阿密颁发的十年来最佳警官的荣誉。拉萨雷校长携高塔（Bubba Smith 饰）、卡伦、泰克布雷、琼斯（Michael Winslow 饰）等一干优秀警校毕业生，与哈里一同赶往迈阿密参加警方盛典。在出机场时，拉萨雷误将窃贼团伙装有赃物珠宝的手提袋拿走，无法向委托人交差的窃贼们只有在24小时内从拉萨雷处娶回珠宝才有活命的希望。参加盛典的警校精英们在迈阿密享受着美妙的阳光，不知危险正在暗中逼近……

故事从一个关于拉弥亚（希腊神话中的人首蛇身女怪）一个美丽的女王的古老传说开始。她的爱人被杀死，她被变成了一条蛇，她开始肆无忌惮的杀戮直到上帝把她变　　成石像。现在，她返回人间的时间到了……

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 into a Mermaid at the age of twelve, Siren must struggle with her new reality, saying good-bye to her mother and friends, while she transitions into the water. To make matters worse, a group of hunters are trying to catch her. She soon becomes friends with Adam Wilts, a new boy at school, who she turns to for help. He agrees to help her, but finds himself caught in the middle, when it's his own father who is after Siren. When Siren's mother is taken, the town must rally behind her, and help her make a peaceful transition into the water, before the hunters can find out where she is.