年轻人阿政（谢霆锋饰）总想着能有不一样的生活，向往去南美。一次偶然，他邂逅卧底女警察（徐子淇饰），当上了“准爸爸”。为了筹钱抚养女方肚中的孩子，阿杰辞掉了酒吧招待的工作，跟随吉叔（黄秋生饰）做起了保镖。 阿杰（伍佰饰）多年来在南美担任雇佣兵，在经历枪林弹雨的战火生活后， 他想着洗手告别过去，回到香港娶了慧（卢巧音饰），她是香港有权势的黑社会老大的女儿。一次阿杰无意中结识了阿政。 而阿杰为了照顾妻子，独吞了钱财，昔日战友们很快追到香港，一场恶战在所难免。

The Story is about a power battle which is taking place in the higher echelons of power unrelated and unconnected episodes occurring in different parts of the globe, Intertwine in an unforeseen manner to a revelation of mind games. The story delves the audience into the game of a brilliant master mind to reveal the true nature of all that are involved. It challenges the perceptions of who is the hunter and who is the hunted. It blends in a thrilling story with commercial elements of story telling to deliver a high octane action entertainer appealing to all segments of the audience.