The midnight bell in Chang'an City hides a secret more bizarre than the moonlight. Chen Shi, a small flag officer of the Jinwu Guard, picked up half a bronze waist badge while on patrol, but he did not know that it was a token of the "Night Patrol Division" that was destroyed a hundred years ago. When he bumped into Aisha, a Persian dancer disguised as a man in the ghost market, using an astrolabe to locate evil spirits, and saw the blind scholar Shen Mo using an abacus to calculate the murder case, he was shocked to realize that the three of them had automatically formed a detective team because of the fragments of their waist card:
- **Chen Shi**: On the surface, he is a mortal who is afraid of ghosts, but he can crush the cervical vertebrae of zombies with his bare hands. The jade pendant around his waist always gets hot when encountering ghosts - that is his erased memory of being a demon subduer.
- **Aisha**: A foreign princess who fled with twelve gilded mirrors. The throne usurped by her brother was sealed in the mirror. When the astrolabe turns, the image of the last ten breaths of the deceased can be seen.
- **Shen Mo**: The blind fortune teller who has calculated all the secrets but cannot calculate his own destiny will cough up blood every time he moves the abacus, just because he exchanges his eyesight for the ability to see through the "Chang'an Earth Vein".
The three of them followed the clues of the waist badge and went deep into the abandoned palace, and found a blood tablet engraved with hundreds of family names under the collapsed Xuanwu Gate. It turned out that a hundred years ago, the Night Patrol had sacrificed the birth dates of the people in the city in order to suppress the demonic tide. When Aisha's astrolabe revealed the truth about Chen Shi Yupei, Shen Mo's abacus suddenly stuck on the last square: "The next sacrificer... Is ourselves." The night in Chang'an was like ink, and three people bound by fate stood back-to-back in front of the blood monument, and the bronze fragments around their waists began to heat up - they were both the game-breakers and the last pieces of this strange chess game.
