Chang Zheng, the vice captain of the criminal police brigade, is investigating a shooting case in a suburban villa and locks up the suspect Zhao Pengxiang. The second child of the Zhao family, an inspector who didn't want to be involved in the death of Zhao Pengcheng, then becomes a wanted criminal. With the help of a secret investigation team dispatched by the Ministry of Public Security to investigate the truth, Chang Zheng not only faces confrontation with his relatives and loved ones, but also discovers his real identity. In the end, he discards his affection and chooses justice, and cooperates with the secret investigation team of the Ministry of Public Security to arrest the criminal.

十年前，赵海洋与方程在追击一起灭门案的杀人凶手时，因赵海洋的异常举动引起歹徒警觉，导致了师傅夏辉的牺牲。十年后，赵海洋从一个普通警员成长为东州市公安局的副局长，方程则带着自己研发的技术成果回到东州市进行警务改革。二人相见并没有想象中的友好，赵海洋对方程充满了成见，同时对他带来的警务改革思想也充满了抵触。近年来，各种新型犯罪模式不仅让赵海洋应接不暇，更是让同样身为警察的妻子安萍被下放到派出所。束手无策之际，方程利用新的刑侦技术手段为赵海洋解决了众多难题。智能交通、合成侦查中心、网格化建设让犯罪分子无从遁形，反诈中心让诈骗分子无从下手，环食药支队建立，让老百姓吃的更放心。警务改革工作也如春风化雨一般逐步展开，初见成效。就在一切顺利进行的时候，十五年前的灭门案凶手浮出水面，赵海洋与方程联手誓将凶手缉拿归案，但是在侦查过程中，似乎总有一股强大的势力在阻挠着案件的侦破……