情事：只恋爱不结婚

　　高级警官康Sir遭人杀害，临死前他销毁了所有卧底的资料，以保护这些游走在生死线上的兄弟。在此之后，警方开始着手恢复数据，与卧底们重新取得联系。女卧底阿钉（佘诗曼 饰）某天收到一条康Sir发明的密码，在刑警男友阿Q（吴镇宇 饰）的指挥下，她尝试与这名神秘卧底进行接触。另一方面，某披着合法公司外皮的黑道组织重要成员阿蓝（张家辉 饰）和邵志朗（古天乐 饰）联手袭击了竞争对手。这二人情同手足，在公司少壮派中风头正劲，如日中天。然而警方对他们行动的预判令阿蓝开始怀疑公司有内鬼存在。　　经过几番试探，阿钉终于与神秘卧底接头，可是莫大的危险也向她奔涌袭来……

　　The movie follows Fela Blackburn, whose life is shattered when she loses her husband, Rodney Blackburn, at the hands of a police officer. Determined to get to the bottom of the incident and seek justice, she leans on her best friend, Marley Wells, who is a lawyer, and her husband, Tony Wells, who is a former cop turned private investigator, to use their influence to find the truth. But as the truth unfolds, Fela learns that her entire world is rooted in lies and betrayal.

　　The movie follows Fela Blackburn, whose life is shattered when she loses her husband, Rodney Blackburn, at the hands of a police officer. Determined to get to the bottom of the incident and seek justice, she leans on her best friend, Marley Wells, who is a lawyer, and her husband, Tony Wells, who is a former cop turned private investigator, to use their influence to find the truth. But as the truth unfolds, Fela learns that her entire world is rooted in lies and betrayal.

　　故事梗概　　本片为香港德宝电影公司的创业巨制之一，由杰出的摄影指导钟志文升任导演，是一部热闹的浪漫冒险喜剧。内容描述一名地下军火专家制造了一个小型炸弹企图有所不轨，计划被助手知悉，以致他杀人灭口，但却被三名互不认识的平凡寂寞人目睹此事件。两名疯狂杀手奉命追杀三名目击者，他们乃展开逃亡，过程中发挥同舟共济的精神来化解危机。全片是典型以追杀为主戏的娱乐片，但不强调暴力动作，反而有不少惊险笑料。三个主角的个性也纯真好玩，将都市寂寞人偶然碰到刺激遭遇时的反应生动地表现了出来。