Do you believe that there are really aliens in this world, they occupy the night sky, the underground, the unknown waters and places that humans cannot reach, and they can be everywhere as long as they are willing. In contrast, humans are so weak and so vulnerable. The story begins with the introduction of a bizarre suspense case by two thieves. The suspects escaped and the four victims suffered a terrible encounter. The strange fingerprints and unidentified body fluid left on the scene made the case handler unable to explain. For a time, all the media rushed to report that in order to prevent the public from causing greater panic, the Municipal Bureau set up a task force and demanded that the case be quickly resolved. (Source: movie.douban)