Three years ago, there was a murder in Pinghai City. In the process of capturing the suspect Cao Ming, the criminal police chief Ding Wei sacrificed heroically to protect the hostage. After three years, similar cases were again staged. For this reason, the Pinghai Municipal Public Security Bureau decided to transfer the backbone of the criminal police detachment: Xu Zhixin, the criminal police chief; Liu Jing, a criminal psychologist; Luo Hai, the detective expert and deputy captain; physical an...