本片以当年张子强惊天大案为背景,真实的反应了张子强的犯案过程。张家豪(任达华 饰)是个有极高智慧的悍匪,他接连策划了多宗金铺劫案、富豪绑架案,警方虽明知是他所为,但却苦无证据。很多富豪被张绑架,但都有所忌讳,选择了交纳巨款赎金,一时间连警方也无可奈何。终于有一次,张的拍档叶世官失手被捕。凶狠狡猾的张竟想绑架政务司长钟方安心以交换人质……This film is based on the real life kidnapping spree of Cheung Tze-Keung who was eventually executed in China December, 1998. Cheung Chi-ho (Simon Yam) makes a living by kidnapping the children of very rich people. However, he's a nice guy outside of 'work', even going so far as to help a little old lady cross the street as the film begins. Cheung Chi-ho is plotting to kidnap several adult sons of Chinese millionaires. Because of their vicious threats, most of these cases go unreported to the cops, and all goes well, until Cheung teams up with another big-time criminal, Cyclone. On their first job, the rich victim calls the police, and Cheung Chi-ho must strategize his next move against the police.