A private reasoning team composed of former criminal police officers, forensic scientists, technical geeks and psychological experts was invited to assist the police and all walks of life in investigating a series of bizarre cases. Starting from small cases on the surface, we gradually reveal the intertwined dark forces hidden on the surface of modern cities. During the investigation process, team members not only have to face endless mysteries, but also face their own past and inner pain. The story runs on multiple lines, including the growth and entanglements of each member, as well as the complicated social issues behind the case. As each case is gradually revealed, everyone in the team finally points to a major case that lasts ten years and concerns everyone's fate - the mysterious murder chain.
