Two chess masters are entangled in several murder cases related to organ transplants. A cop and criminal psychologist Calvin Che have to work together to find the missing link, whilst facing various dangers.

Four loser gangsters devise a scheme that is eviously ingenious (or profoundly stupid): to disguise a minibus as a police vehicle to rob cross-border rucks that carry human carcasses with money inside. The ploy kicks into action one evening in the New Territories, and the plot thickens with spooky and deadly encounters, including one with an identical police car – also a fake, but manned by killer gangsters who are after the same dead bodies.

By a strange twist of fate, dutiful Hong Kong policeman Dan saves the life of the leader of a violent gang of armed robbers. When they commit another crime, Dan is determined to put an end to their activities. He works with the leader, whom the gang had betrayed, to engineer a plan to wreak havoc within the gang and let the gangsters kill one another. But it becomes increasingly obvious to Dan and to his colleagues that Dan is suffering from a severe mental disorder, and Dan finds that instead of upholding the law as a righteous police officer, he has now become a fugitive wanted for murder.