The Qin Dynasty unified Liuhe, and in the late period of the First Emperor's reign, undercurrents inside and outside Xianyang were surging. The old tribes of the Six Kingdoms were dormant and restored, the officials in the court were corrupt and perverted the law, strange cases occurred frequently in the streets, and many unsolved cases relied on the theory of ghosts and gods to cover up man-made crimes. The majesty of Qin law was repeatedly trampled on. Xie Tieyue, a direct descendant of the Xie family in Chen County, holds the Qin Huanshou sword, a hundred-refined system passed down from generation to generation. He has studied the ancient forensic investigation techniques of Qin's "Feng Diagnostic Style" since he was a child, and possesses unique skills in criminal investigation and case investigation. He joined the imperial court in Xianyang and met Lin Wanqing, a smart and courageous imperial censor, and the two became close friends in investigating the case. The team relied on the three-level judicial system of the Qin Dynasty and followed the official laws of the Qin Dynasty to solve a series of strange cases such as murders in secret rooms, corpses in granaries, interceptions on the street, secret crimes in the palace, and injustices in the clan. After layer upon layer of investigation, it turns out that the ordinary murder case was linked to the old aristocracy's monstrous conspiracy to overthrow the Qin Dynasty. The traitors in the DPRK colluded inside and outside the party, tampered with prison certificates, and defrauded the head of Guizhou. The whole book adheres to the official history system and is adapted from the local vernacular. There is no fantasy and fiction, hard-core logical reasoning, and a dense collection of exciting points: solving unjust cases, killing villains, confronting powerful family members, and protecting the justice of Qin Dynasty. Xie's Qin sword was unsheathed, parting the fog in the sky, conducting criminal investigations with ingenuity, and guarding the laws of the mountains and rivers of Daqin!