Three policemen were killed at the beginning of the magic police case. Li Jun, played by Liu Qingyun, judges that the fourth man killed three policemen at the scene. But no one believes that it is treated as a mental illness.
17 years later, a serial murder occurred in Hong Kong. A group of young people formed a gang called detectives. They killed people but claimed revenge. These people turned out to be relatives and descendants of people who died in various unjust cases over the years.
Fang Lixin and his wife are also called detectives in the police. Li Jun, who left the police, often talked to himself and was in a state of mental confusion, but he still insisted that he was a detective. Detective No.3 began a seemingly chaotic story.
After the serial murder, there will be a German sentence left at the scene. This seems to mean that there is some connection between these cases. In order to find out their criminal patterns. Li Jun will analyze many murders over the years. Finally found some clues, which have a lot to do with the butcher case that killed many people.
In a crazy state, Li Jun surpassed the imagination of ordinary people and used subtle reasoning. Confirmed that Fang Lixin was behind the series of cases. There are also murderers in the magic police case and the butcher case. The truth came out and the wicked got the punishment they deserved.
The reason why the film is a "detective war" rather than a "detective" is that there are more than one "detective": the first is Li Jun, the second is a criminal gang that calls itself a "detective", and the third is the ultimate boss in disguise. There is a recurring Nietzsche famous saying in the film: hit the monster, be careful to become a monster.
There is a thin line between "God" and "Demon": Li Jun became a madman because of his high opinion of himself; The "detective" gang is the offspring of a group of old mystery victims. They gathered together to try to do justice for heaven, find those murderers who have not been brought to justice, and lynch them by extremely cruel means. "Big Boss" had a tragic past, but he finally chose to take revenge on society.
Only Li Jun escaped the vicious circle of revenge. Once paranoid about being a detective, he finally found that he was not a "god" who never made mistakes: he was misled by the big boss for many years and missed the truth; In life, he lost his wife and ruined his daughter's life by neglecting his family. At the end of the film, Li Jun can say that "we are not gods, just exploring", which is the most remarkable place of this character.