Champion competitive marksman Ken comes across an armored van robbery. He sees a policeman held hostage and shoots and kills four of the robbers. One of the robbers escapes and the policeman survives. The case is handled by Jerry Chang, whom Ken knows from having recently beaten him in a shooting match. Ken is found not guilty in court. Soon after, Ken is attacked by the escaped robber Pang Tao. Their confrontation reveals a very different background story and brings about a myriad of lies and traps and changes in relationships as Jerry and Ken try to outsmart each other.

Detective Sergeant Ma Jun, known for dispensing his own brand of justice during arrests, teams up with an undercover cop, Wilson, to try and bring down three merciless Vietnamese brothers running a smuggling ring in the months before mainland China's takeover of Hong Kong. Jun pursues the gang tirelessly, sometimes ignoring police protocols. A showdown is inevitable!

2003 film directed by Andrew Lau and Alan Mak

Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.

Tough cop Ken Li (Cheng) is at the top of his game, but he's going to need some help to solve a grisly crime that the offender, a respected police officer, doesn't even remember committing. He seeks out Jack Lai (Lai), a former psychologist now in disgrace and behind bars, who has an uncanny ability to bend people to his will. Making an uneasy truce, this unconventional pair set out on a mission to find the man responsible, a master of hypnotism who will stop at nothing to get his revenge!

相传警方派驻了上千卧底深入黑帮，就等时机成熟把社团一网打尽。此时警方雄图大志，将潜伏已久终于爆发的行动命名为“百年孤寂”。洪兴社树大招风，社团里各个话事人开始草木皆兵。相反洪兴老大淡定自若，他的女人苏菲（秦海璐饰）替他周旋于各帮派期间，力稳局势。
然而洪兴社团的众人已经按捺不住躁动。人人自危的情势开始：分管不同领域的华超（吴镇宇饰）、黎继祥（曾志伟饰）、钟孝礼（张智霖饰）、游志标（陈小春饰）几人当中，有的已经被警方掌握了犯罪证据，有的正陷入一场恐慌，看不清身边谁人是卧底身份。警方铲除洪兴社团即日可待。