一对姐妹花同住一栋楼上下楼，姐姐是个小说家叫如行，妹妹是名摄影师叫如仪。这天如仪在阳台摆弄相机时无意间拍到对面楼一对男女正在亲热的画面。如仪有些羞涩，觉得自己偷窥了别人隐私。如仪原没把此事放在心上，直到她无意间在街头遇到一家三口逛街，而一家人中的女主人正是她无意间拍到的亲热男女中的女方，而男主人却并不是亲热男女里的男方。这勾起了如仪的好奇心，她开始继续偷窥对面楼男女。姐姐如行发现了如仪的做法嗔怪她这么做不道德，如仪辩解自己只是借此找找摄影灵感。如行被触动，她的小说创作也正遇到瓶颈。在如仪鼓动下，如行也加入偷窥中。然而不久如仪便发现此事似乎并不单纯，如行的小说情节竟然如预言一般出现在亲热男女的行为之前。如仪越来越觉得事情不简单。随着事态发展，如行如仪姐妹俩不经意间卷入一场凶杀案之中…

A pair of sisters live upstairs and downstairs in the same building. The elder sister is a novelist named Ruxing, and the younger sister is a photographer named Ruyi. On this day, Ruyi accidentally took a picture of a man and woman making out on the opposite building while fiddling with the camera on the balcony. Ruyi is a little shy, feeling that she has peeped into other people's privacy. Ruyi didn't take this matter to heart, until she accidentally met a family of three shopping on the street, and the hostess of the family was the woman among the intimate men and women she accidentally photographed, but the host was not. Make out with the man of men and women. This aroused Ruyi's curiosity, and she continued to spy on the men and women in the opposite building. Ruxing, the elder sister, found out what Ruyi did and blamed her for being immoral. Ruyi argued that she was just using it to find inspiration for photography. If Xing is touched, her novel creation is also encountering a bottleneck. Encouraged by Ruyi, Ruxing also joins in the voyeurism. However, Ruyi soon discovered that this matter seemed to be not simple. The plot of Ruxing's novel actually appeared before the act of intimacy between men and women as predicted. Ruyi feels more and more that things are not simple. With the development of the situation, the Ruxing Ruyi sisters were inadvertently involved in a murder case..