On a rainy night in Qingwu City, in a storage room in an old neighborhood, the body of a young woman Su Yao broke the silence of the rainy night - the metal wire marks on her neck showed fatal injuries, and the strange number "7" on her wrist was even more abnormal. Lin Shen, the criminal police captain, led the team to intervene. An anonymous letter and a box-shaped signature marked "The game begins" opened the dark prelude to the serial murder case...
