"Cold Case Code: A Chronicle of a Murder Case Spanning Thirty Years" takes the "Case of a Female Corpse in a Brick Kiln" that has been buried for thirty years as its starting point. It tells the story of Li Jianguo, a retired detective who is about to retire and digs up the backlog of cases in the archives to fulfill his master's last wish. However, he unexpectedly discovers that there is a deliberately concealed truth hidden behind the case. The word "debt" written in blood on the chest of the deceased Zhou Hui, the hexagonal nut left at the scene, the mysterious symbols in the night watchman's notebook... Every clue points to the secret buried by time.
As the investigation deepened, Li Jianguo discovered that the case was inextricably linked to the deceased's brother Zhou Wei, witnesses from the year, and even more unknown figures. Behind the so-called "debt", there were family grievances, interest entanglements and the abyss of human nature that spanned thirty years. When a new murder case reappears with similar techniques, Li Jianguo realizes that this is not a simple revenge, but a "code game" that has lasted for three generations - every symbol, every scar, and every seemingly unrelated testimony is a code left by the murderer, waiting to be deciphered.
The novel unfolds using documentary techniques, intertwining the detective's persistence, the victim's struggle, and the murderer's paranoia in the torrent of time. In the process of tracing the unsolved case, it not only reveals the truth of the murder case, but also dissects the light and shadow of human nature in the changing times, and explores the deep propositions of "crime and punishment," "memory and forgetfulness," and "repayment and redemption." The thirty-year time gap has made the evidence dusty, but the truth has become clearer as the layers of cocoons are peeled off - some debts are destined to take a lifetime to repay; some passwords will eventually be unlocked in the pursuit of justice.
