This story unfolds from the discovery of 27 bodies on the street, and their bones were removed. Despite the "supernatural" looking of the case, Song Ci, starts an investigation with Yu Mo, to pursuing the ultimate truth of the murder. During the investigation. Song Ci found that this was not a random homicide, and the number "27" is related to the evil cult organization named Boxun long time ago. He asked his old mentor Geng Zhinian for advice. On the same day, all corpses suddenly caught on fire. All the evidence is gone. But Song Ci had to suspect that all this was related to his mentor Geng Zhinian, who was in charge of the Boxun cult case ten yeas ago. In the meantime, Yu Mo, is approaching the "truth", which is a truth she cannot accept .