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Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.
Pop star Anna has been kidnapped. Kidnapper JASH uploads the video clip of Anna being tortured onto the internet, which instantly becomes the talk of Hong Kong. A week later, JASH contacts the police, asking not for a ransom but for retired police inspector Mo to be his police contact. Inspector Mo eventually discovers through a tabloid magazine that a self-proclaimed psychic named Shana had phoned a radio program on the day of the kidnapping to warn of the incident.
Michael is a cop chasing uncommon serial killer Sung Ping, who one day kills off a scummy triad on almost a whim. Liking the aftermath, he proceeds to plan his next few killings much to the dismay of the local triads. Meanwhile, reporter Hak makes the real-life crime drama the fodder for his crime fiction serial. Before long, Ping begins using the fiction to fuel his own plans, and soon Hak is concerned that he may be responsible.
In 1970s Hong Kong, the Independent Commission Against Corruption (ICAC) was formed to bring down the corruption syndicate led by British government officials. One of its top investigators is Senior Investigator Lau Kai-Yuen, who brought down countless corrupted officials. Just as he thought stability and prosperity are within reach, a new era of greed and riches takes him into a new battlefield of corruption.
