A murder in broad daylight, a kidnapping followed by the disposal of a body, and poisoning in a private home. In a small city that had gone years without a murder, three killings occurred within three months.
The killer was meticulous, and the police found no trace of them at any of the three crime scenes.
As the investigation deepened, the police discovered that all three victims were connected to a sexual assault case involving a girl from many years ago. Moreover, the witness testimony and physical evidence they had gathered all pointed to Yang Guang, a boy with intellectual disabilities.
Could Yang Guang be the real killer?
The police knew that Yang Guang was not intelligent enough to carry out the three murders, so Li Xiaofu, the girl who had lived with him all along, became the prime suspect.
Could Li Xiaofu be the real killer?
Just as the case was about to be closed, Guo Zheng, head of the task force investigating the three murders, noticed inconsistencies in the evidence. When he applied to reopen the investigation, his request was rejected by Director Li Xinghe, and he was suspended from duty.
In the end, the truth came to light under Li Xinghe's leadership. But was this really the truth?