In The Four 3, Emotionless has left Six Doors, as has Cold Blood, who has decided to investigate the death of Lord Bu on his own. The departure of two of the four constables has effectively left Six Doors defunct. At this time, trouble begins to brew in the Imperial Palace as Emperor Huizong plans to travel incognito to the outside world. When he is almost killed by one of his bodyguards, the leader of the constables, Zhuge Zhengwo, is forced to resume his previous identity as a member of the Imperial Secret Police in order to solve the mystery.