Big Nose Pao is a faithful and honest constable that has been tasked to arrest Three Hands, a pickpocket. However, each time the pickpocket is caught, he's released by the lack of evidence. Although Three Hands steals for a living, the money that he takes from the rich people, is spent on the seven poor orphans with whom he lives in an old shaky church.

Keung has a pregnant wife but he has been unemployed for a long period. One day he gets a new job as a security guard in a commercial building. But strange incidents start happening and his colleagues die in horrible ways one by one. A geomancer tells Keung that he will be the next victim and teaches him how to avoid his fate. But Keung begins to notice his wife's strange behaviour...

Cops and Robbers depicts a city where ordinary citizens hold little trust for the police; far removed from the post-ICAC Hong Kong of today.

An undercover cop goes deep undercover to inside one of Hong Kong's most notorious Triad gangs only to find him getting consumed by a life of crime and seediness.