In the modern urban context, a private reasoning team composed of former police detective Gu Qian, corporate executive Chen Peiran, underground informant Li Yutang, psychological analyst Wu Yifan and cyber hacker Zhou Xuhua specializes in solving complex unsolved cases that the police cannot solve. The team members each have their own concerns, and the cases are intertwined with each other, not only involving power, interests, conscience and the dark side of human nature, but also involving their respective secret pasts. As a series of unsolved cases involving collusion between politics and business came to light, the team found themselves gradually being involved in a larger conspiracy and struggle. Each volume focuses on an independent case (connected in series with each other), while advancing the main line of unresolved cases and the main line of member growth. As the reasoning deepens, some people are in danger, and some people have to make difficult choices. In the end, the deepest fog of the city is revealed, and self-salvation and identity reconstruction are completed.
