During the prosperous period of the Tang Dynasty, bizarre murders occurred one after another in Chang'an City.
A high-ranking official fell to his death, and the doors and windows of the secret room were locked; a wealthy businessman drowned in the cellar, and there was no water in the room; a Taoist priest burned himself to death, and the alchemy furnace had long been extinguished... Every case is an impossible secret room murder, and every scene leaves behind mysterious gossip symbols.
The magistrate of Chang'an County, who once studied under Jiang Hu Hermit and was proficient in Qi Men Dun Jia, was keenly aware that these cases followed a certain terrible pattern: eight murder cases, corresponding to the eight hexagrams, and each hexagram has a secret room technique. The murderer seems to be acting in accordance with ancient prophecies, trying to awaken some mysterious power through gossip and murder.
As the investigation deepened, the county magistrate discovered that all the deceased were related to an unsolved case twenty years ago. And his senior brother, the mysterious alchemist from the Western Regions, his former confidante... Everyone around him is suspicious.
When the seventh case occurs, there is only one last step left from the completion of Bagua. Who will be the next victim? Why is the real murderer crazy? What happened twenty years ago?
To crack the mystery of the Eight Diagrams is to uncover the dust-laden truth.
