Working overtime late at night, Shen Jinwan received an ancient book with blank pages.
A line of bloody writing appeared on its cover: Return home after midnight. If the lights flicker three long times and two short, take seven steps backward and keep your eyes closed for thirty seconds.
She followed the instructions and saw bloodstains where she had been standing.
The book said: You have become a Recorder. Every floor of this building has a "Night Watcher." The little girl on the fourth floor has been dead for twenty-five years, the actor on the sixth floor never opens his door, and the Bloody Hand on the fifth floor lives next door to you.
Shen Jinwan thought they were the most dangerous things.
Until new rules appeared in the book: Trust no one, including yourself.
Good. . . . . . .