根据中国古典名著《聊斋志异》改编。 　　秦汉年间，都尉王生（陈坤 饰）率王家军在西域苦战，并救回一女子小唯（周迅 饰）。王生并没有看到在他到来之前，小唯刚刚吞食完人心以保持人形。九霄美狐小唯对王生一见钟情，跟随他回家后以妹妹自居，眼看王生与佩容（赵薇 饰）夫妻情深，暗地里想取代佩容地位成为王生妻子。深爱着小唯且一直为她杀人取心的蜥蜴精小易几度向小唯表白，却被小唯怒吼而走。 　　城里越来越多的人死于心脏被挖，王生誓要查个水落石出，佩容已经觉得小唯异于常人且对丈夫有意。碍于王生对小唯的一片信任，她唯有去寻求当年负气出走的旧情人庞勇（甄子丹 饰）帮忙，而降魔者夏冰出于天命亦自告奋勇去除妖。 　　佩容所作一切但求王生安好，王生心痛佩容不相信自己，小唯委曲求全希冀得到爱情，庞勇和夏冰已蓄势待发。Where there is trouble, there is solution. This time, the troubles comes from two myth spirits that take the form of a human. Disguise in human skin and clothes, the two continues to take the heart of human to stay alive and young. But one of them leads to the wrong path and fall in love with a married man. What will happen to the live of this man and his wife after saving the her from the barbarians?