Criminal police captain An Bang cracked a major drug manufacturing and trafficking case, but his wife Lian Hua was killed by a fugitive criminal. The murderer left only the clue of six-finger handprints and has been at large. An Bang, who lost his wife, has never recovered since then. In order to take care of and accompany his daughter who was depressed and autistic after losing her mother, An Bang applied for a long vacation and left the police force. There were two consecutive homicides in Banquan. The case was complicated and confusing and had not been solved. Director Zhao Yuanliang asked An Bang to return to the team to solve the case several times, but An Bang refused. With the further investigation of the case, the murderers surfaced one by one, and the six fingers who killed An Bang's wife became an important suspect. Upon learning that the six fingers reappeared, An Bang returned to the police force. When the suspect six fingers were about to be arrested, he died unexpectedly and was turned into bones in the crematorium. The case was upgraded to a three-city serial murder case. An Bang was ordered to take charge of the situation, and he regained his spirits and led the criminal police team to fight against the dark forces in a battle between good and evil. He eventually solved the case, arrested the real murderer, and revealed the truth of another tragedy that happened sixteen years ago.