Under the shadow of the city, various bizarre and unsolved cases occur frequently. A professional reasoning team consisting of six people including a former police detective, a forensic psychologist, an IT expert, a criminal police officer, a social investigator and an international criminal portraitist came into being. They jointly tracked down the "Silent Killer" series of cases, but unexpectedly uncovered the "Gray Shadow Project" that has lasted for more than ten years and implicated political and business giants. Team members each bear their own scars. During the investigation of the foggy case, they not only have to face the darkness of society and the distortion of human nature, but also face their own fears and past secrets. Multiple storylines are intertwined, and each case is both self-salvation and confrontation with fate. When all the clues gradually gathered, the team discovered that the situation they were in was far more sinister and complicated than imagined.
