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On a rainy night, a murder occurred in a watch factory that had been abandoned for many years. The deceased was the newly released former factory director Shen Jingshan. When he was found, he had a rusty wrench stuck in his chest, and his right hand was holding a half-broken old pocket watch. The hands were always stopped at 3:17 in the morning. When Lu Zheng, the criminal police captain in charge of the case, arrived, there was only a strange trace on the scene, but it stopped suddenly one meter away from the body, as if the murderer disappeared out of thin air. What's even more bizarre is that the forensic doctor determined that Shen Jingshan's death time was three days ago, but witnesses insisted that they clearly saw lights flashing in the factory last night. As the investigation deepened, Lu Zheng discovered that Shen Jingshan's death was closely connected with a disappearance case in the factory twenty years ago: the security guards at that time, Shen Jingshan's deputy, and even the family of the missing female worker were all deliberately hiding something. Everyone's testimony contained contradictory details, like misaligned gears in a clock, intertwining lies and secrets. When Lu Zheng tried to piece together the truth, strange things began to happen around him: the clock at home would always stop at 3:17 for no reason, the anonymous threatening letter had a pocket watch pattern printed on it, and the half-broken pocket watch actually turned quietly for a second in the evidence bag... He gradually realizes that this is not only a murder case, but more like a carefully designed "time game". The murderer is using death as bait to lure everyone back to the same rainy night twenty years ago, revealing the truth that has been dusted by time and can subvert everything. And what is hidden at the end of the disappearing footprints may not be the murderer, but a past that even the deceased is unwilling to face.