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This book is a crime documentary that records the real cases encountered by trace inspection expert Liu Shenyin in his work and the human nature hidden behind the murder scene. Does the perfect crime really exist? The man committed suicide by burning charcoal indoors, and sealed the doors and windows with tape before his death. Behind this seemingly bizarre case, there was actually a cruel suicide game hidden; a 19-year-old girl waited for 20 years to get revenge on her ex-boyfriend, and every day during these 20 years, she would think about the same thing Things: Returning to him and letting him experience what she had experienced back then, she formulated a revenge plan; the man was bitten to death by a silver snake at the resort. The more Liu Shenyin investigated, the more horrified he became. He concluded that it was a murder, and at the same time, all the clues pointed to his best friend. This book will take you deep into the crime scene. Through the traces left at the murder scene, you can trace the hidden life behind each real case and explore the "hell" in everyone's heart.

This book contains real case records of Liu Shenyin, an expert in trace inspection. Liu Shenyin frequently visits various extreme scenes and specializes in solving difficult and unsolvable cases. He does not see many bizarre crime scenes that others only see once in a lifetime: the girl died miserably in the mine, but the fingerprints on her body belong to a person who has long since died. ; There is a serial female killer who likes to "sign" at the scene. After every killing, she leaves a lip print of her own at the crime scene; a sexually assaulted female body is left in the wilderness, and her murderer also died at the same crime scene, less than 200 meters away from her. There is a pair of eyes that witnessed the whole process of the murder in the dark... Solving the case depends not only on the traces at the scene, but also on many traces in life and social relationships. Liu Shenyin will rely on these "traces" to uncover the suspects hiding behind the scenes. "You may not have left any traces at the scene, but can you not be connected to the world?"