Six years ago, a hitchhiking murder case occurred on a rainy night in Tianyun City. The victim Fang Yuansong was killed. His son Fang Lu witnessed his mother's mental disorder. He himself was ridiculed and discriminated against, and he felt hatred. Six years later, a similar case occurred again. The victim Feng Xinsheng was killed, and his wife, Sister Wang, put pressure on the police. Rookie police officer Liu Yuan was involved in the investigation. The police found that the two cases were similar but had differences. The new case encountered many difficulties and there were no clues at the scene. The information about the murderer's ride pointed to the missing female student Zhu Xiaomei. Female criminal police captain Wang Mengyu took over and proposed the hypothesis that the murderer used special recording shielding equipment. Liu Yuan assisted in repairing the anti-shielding equipment and discovered that Feng Xinsheng had a conflict with others before the incident, and the victim Su Xiaoyuan was also related to the incident. The investigation found that Su Xiaoyuan was related to Zhu Xiaomei. Zhu Xiaomei frequently visited high-end restaurants. The owner of the restaurant, Feng Tao, was a Chinese American. The surveillance was destroyed. Zhu Xiaomei's consumption records were abnormal and she was suspected of being involved in illegal transactions. The police revealed a black industrial chain involving many female students who were victims. Feng Xinsheng and Wang Bo were important figures. In order to find out the cause of his father's death, the murderer Fang Lu planned a series of murders and used specific conditions and equipment to cover up his traces. The police found key evidence through technical means and investigation and convicted Fang Lu. Fang Lu admitted his crime, but showed no regrets for some of his actions. Shi Rui was a member of an overseas spy organization and sneaked into the arrest scene, seriously injuring Wang Mengyu. Shi Wuyue is a policeman. After discovering that his daughter was abnormal, he exterminated her relatives, but failed. In the end, Fang Lu was convicted, the black industrial chain was uprooted, the victimized female students were rescued, and social order was restored. After going through the test, Wang Mengyu gained a deeper understanding of career and life, and Liu Yuan also grew up.
