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The Criminal Investigation Detachment of Nancheng City Bureau has a special trio. Forensic doctor Lin Mo, using the corpse as his speech, uses a cold scalpel to cut open the disguise of death, and the silence hides the sharp edge to uncover the truth; Captain Lu Yan, guided by intuition, jumps through seemingly irrelevant clues, and his unruly appearance is extremely sensitive to doubts; trace examiner Su Zhe, focusing on the smallest details, restores the scene from one fiber and half a fingerprint, paving the path to the truth with meticulousness. Three people with very different personalities are like three keys with different tooth marks, but they can always work together to open the most complicated lock. Skeletons in an abandoned factory, charred corpses in secret rooms, murderers who disappeared from the surveillance cameras, serial copycat cases that spanned ten years... Behind every unsolved case is the abyss of human nature and hidden motives. When calm meets escape, when the macro collides with the micro, they approach the truth in disputes and collaborations, playing a criminal investigation trio about justice, obsession and redemption between the autopsy table, crime scene and laboratory. And in the cracks in human nature torn apart by the case, there are not only the secrets of the murderer, but perhaps their own unspoken past.