His wife and daughter died in a series of murders, and the police were still unsolved. Detective Cheng Ye resigned from public service and used the most cold-blooded means to reopen hundreds of old cases, just to dig out the same pair of dirty hands from the wounds of the deceased. Former partner Su Qinghuai struggled between procedure and conscience, forensic doctor Kou Sanjin sold photos of skeletons in exchange for evidence, mutual aid president Ji Zhiqiu hid a murder diary, and female director Meng Wange's camera secretly pointed at everyone. Until Cheng Ye discovered that all the clues pointed to an abandoned case that was defaulted as "closed" by the system - the murderer had been shot twenty years ago.
