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Xiao Yong is a policeman who has worked at Qianjin Police Station in Lingnan District, Licheng City for eight years. Because he solved the express delivery case, the branch transferred Xiao Yong to the Criminal Police Brigade. However, Xiao Yong refused to work in the Criminal Police Brigade because his master suffered unfair treatment in his early years. Female police officer Xing Zhen has just joined the job and is the daughter of Criminal Police Captain Xing Guan. On this day, Xiao Yong, Xing Zhen and police officer Li Jiansheng arrested people in 504, Building 27, Nanguo Xinyuan, which was being demolished and renovated. They found three gas tanks in the mezzanine of the living room. The Technical Department of the Municipal Bureau took them back to the laboratory and found three female corpses in the gas tanks. The deceased had no clothes and his body was curled up in a gas tank. He died between ten and fifteen years ago. From then on, Xiao Yong started the road of clearing up old cases.