On a rainy night in Nanshan Town, Jianghai City in 2006, Yang Yongshan, a female police officer on duty at Nanshan Police Station, received an anonymous report from the public and found a fugitive, so she went to discuss with her master Zheng Tianhua. The master and apprentice finally decided to go to the police in the rain, but because Yang Yongshan ran into the wrong alley, the master's throat was brutally cut by the assailants.
Director Jiang of the Municipal Bureau was extremely angry when he heard about the case. He took the lead in setting up the first plainclothes detachment and announced the launch of a special operation to crack down on two robbers and one thief and capture the thieves. Yang Yongshan was thanked by the masses for catching the thief in the bus, and was transferred to the plainclothes detachment by the detachment leader Xu Guohao. She also learned the skills of catching and identifying thieves under the guidance of the fire-eyed Scud Lui Zhiqiang. But Yang Yongshan always wanted to continue investigating the case of police officers cutting their throats, so she followed the bag thief in a blind and unexpected way, but unexpectedly discovered a secret place where stolen goods were sold. There were not only thieves of all kinds, but also some small traders. Then the plainclothes detachment started a cat-and-mouse confrontation with the robbery gang. Who was the murderer who killed the policeman and cut his throat? Can Yang Yongshan bring the real murderer to justice?
