In the late autumn when Dongshan City was shrouded in haze, a shrill scream suddenly came from the ancient locust alley at two o'clock in the morning - a female body tangled with red thread hung from the locust tree branch at the alley. The sound of police sirens tore through the night. A middle-aged man with short gray hair stood outside the cordon and rubbed a sandalwood rosary. A section of Nuo pattern woven with colorful silk threads was faintly exposed on his neck. Wang Yingxiong, the yin-yang consultant known as the "Grey Falcon" by the police, was staring at the looming black palm prints on the woman's ankles. This was the third time in the past three months that he had seen such a "red rope hanging corpse case" that went against the laws of nature. As the criminal investigation captain Zhou Zheng, who deliberately kept a distance, handed over the test report: the deceased's blood was as dry as a mummy, but the dry eyeballs were well preserved. The moment Wang Yingxiong's palm touched the corpse's Tianling Cap, he vaguely saw an upside-down bronze bell emerging from the vision of a hundred ghosts walking at night - this was the pattern of the twelve yin and yang artifacts left behind by his father before his disappearance.