狙击手比吉特是海军陆战队的绝密武器，“一粒子弹、一条人命”是他的座右铭。在他那悠长又极富趣味性的职业生涯里，肯定已有超过七十条人命被他夺走。身为美国海军陆战队最具传奇性的狙击手，他每一次的任务是精确地瞄准、然后扣下狙击长枪的板机，一颗子弹从远距离飞至夺走一个毒犯/战犯/刺客/国家敌人的"贱命"。但今次，他的枪口却被逼瞄向他的一个朋友…… 燕迹秦清。
为打击日益严重的犯罪，内地警方应港府要求，派遣向东（徐锦江 饰）、京生（林国斌 饰）、郭学军三名警员，以偷渡客的身份登陆港岛。在港期间，香港警署程Sir作直接领导，本土探员大大（万梓良 饰）协助办案。他们混入内地犯罪集团，惩治烂仔小兴、击毙江家四兄弟，行动干练，手段凶狠。但他们的作风却不为程Sir所欣赏，另一方面，江家兄弟之死也掀起黑帮的复仇怒火，大大更因此丧命。 应京生当年战友阿虎之邀，三人假装参与银行抢劫团伙，暗中则和警方联合，意欲将抢劫团伙一网打尽。然行动前夜，突生变故…
Sometime in the near future, paraplegic prison inmate Matt Mills meets "The Board" of Satoshi-Telefair Industries, who thank him for joining the Program. Under pressure and with a promise to make him walk again, Mills agrees to volunteer. He is injected with a synthetic nanomaterial and suffocated, only to wake up with restored use of his legs, yet alone in a steel cell in the first spoke of an experimental apparatus - The Wheel. A series of assailants inflict a multitude of damage to Mills' body and torment his mind, yet the synthetic nanomaterial not only restores his damaged organs, it re-engineers his strength. The experiment might be designed to kill, but Mills is determined to survive - and get back to his daughter before The Board finds her first.
两个年幼的街头顽童罗和龙成为形影不离的结拜兄弟，在残酷的街头生存下来。当罗在试图偷食物时被法律抓住后，他们被分开了。多年后，龙长大成为一个赌博集团的执法者，却不知道自己也是一个贩毒集团的成员。相比之下，Lo是在一个执法家庭中长大的，并被派去调查该地区的毒品活动。当他们的利益螺旋上升成为共谋时，他们在 法律对立双方脆弱的联盟下重新团结起来。在毒枭马将罗的继父杀害并陷害罗的行为作为报复后，事情变得致命......
