Rusty Puzzle: the Shocking Secret Under the Copper Button

Yunyang, an old industrial city, has become a forgotten corner after workers were laid off, where gray chains breed and murders occur frequently. Chen Mo, a fringe archivist in the police force, specializes in digging into the backlog of cases. When he took over the case of Li Xiuqin falling from a building, he encountered many obstacles and the old detective committed suicide, leaving a mystery. Key clues were unexpectedly obtained during the investigation, such as account books, audio tapes, etc. These clues allowed Chen Mo to connect the case network and discover the shady conspiracy between politics and business behind it. Compared to others, Chen Mo can dig deeper into the hidden truth. Relying on clues, he constantly broke through difficulties and tracked down the mastermind behind the scenes. In the end, Chen Mo will surely uncover the shocking conspiracy that spanned twenty years, let the truth be revealed to the world, and seek justice for the deceased.