香港闹市街头，一辆押款车被前科累累的重犯曹楠（胡军 饰）劫持。重案组高级督察吕明哲（刘德华 饰）率队赶往现场，与曹楠一伙发生激烈火拼。谁知危机关头，一辆突然出现的汽车搅乱战局。曹楠趁机逃走，而那辆车的车主陶成邦（林家栋 饰）被警方请入警局。陶和明哲是老同学，后来作为古惑仔混迹江湖。出事前他刚刚出狱不久。明哲以及成邦的女友燕冰（姚晨 饰）无论如何都不相信他和曹楠无关，而嚣张的曹楠更五次三番戏耍警察。为了抓住这个狡猾凶狠的对手，明哲决定安排内应潜入对方内部，无奈遭遇惨烈挫败。
站在人生的十字路口，陶成邦的选择成为左右战局的关键。而随着风暴愈演愈烈，正邪双方的界限彻底模糊……
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