This heavy rain has been falling for a whole week, but the murderer of the little boy Xiaowen has not been found yet. The police chief has been overwhelmed by the public opinion from the outside world, saying that the police are incompetent, cannot find the murderer, and cannot solve the case. The director also had to put pressure on the people below to arrest the murderer within three days. At this time, policeman Meng Bing, who was looking at the murderer's information, saw Xiaowen. Xiaowen kept pointing outside, probably asking Meng Bing to follow him. Meng Bing called two colleagues and followed Xiaowen to a building under construction. Meng Bing used a flashlight to search every corner carefully, and finally found the murderer under a staircase. In this way, Meng Bing led the way to the murderer through Xiaowen, solved the case, and gave Xiaowen justice. But Xiaowen's mother was so sad that she lost her child and became delirious...