The Haizhou Public Security Bureau chief was shot and fell unconscious. Tian Feng, the former director of the Criminal Investigation Division of the Provincial Public Security Department, was ordered to fly to Haizhou as the acting chief. With the cooperation of Deputy Director Hu Kejian and Criminal Police Captain Zhao Mengnan, he launched a comprehensive investigation into the Ran Jiang case. As the investigation deepened, a new murder occurred again. The economic lifeline of Haizhou City has been controlled by an invisible black hand, and the drug trade is surging. Tian Feng has been repeatedly threatened by evil forces and even framed. He decided to start the undercover plan.