During a routine maritime patrol, Hong Kong Customs seized a cargo ship that was carrying a large number of lethal weapons. During the investigation, they encountered bombing and looting by a group of overseas forces. In order to track down the truth of smuggling, Zhang Yunan (Jacky Cheung) sent his subordinate Zhou Zhengli (Nicholas Tse) to travel overseas with Interpol to explore the huge and complex arms black market. Zhou Zhengli, who was tracking down clues under heavy fire, had just made some progress when bad news suddenly came from Hong Kong. It turned out that there was another hidden story behind the theft of arms...