Tensions flare between PTU officers and the Complaints Against Police Officers unit when a security camera captures a triad member being brutalized by PTU officers.

Rumor has it that “Black Moly”, the Indian head of a gang has returned. His former subordinate Velu is released from prison, he refuses to follow the same path as before. But he is misconstrued by his buddy, Sonu that Velu betrays him. Sonu accepts the task for killing PTU’s Team Head. Sam and May from PTU and Velu can’t easily leave themselves out of account.

Two tactical unit leaders are forced to put aside their differences to help catch a group of robbers.

CID officer Tong gets himself entangled with a gang of killers from mainland China, who are out killing criminals to rob them of their money, and using an ideological basis to justify the killings as protecting mainland China from the criminal scum of Hong Kong.

Follows a police tactical unit during one dangerous night on the streets of Hong Kong as they try to recover a cop's stolen gun. Things turn deadly when they run into a web of gangland crimes.

After a late-night triad dispute leads to the death of an innocent civilian, PTU officers take action by investigating triad activities in the area.