Australian authorities arrest a man believed to be connected to the Sydney criminal underworld and send for Inspector Fang Sing Leng (Jimmy Wang Yu) from Hong Kong to question him. After the alleged criminal is assassinated, Inspector Leng and the Sydney police try to hunt down those responsible and hope to solve their case along the way.

In the 1940s, school teacher Fang Lan becomes embroiled with the resistance efforts of local guerilla group Dongjiang during the Japanese occupation of Hong Kong. Fang is recruited by one of the resistance group’s captain Blackie Lau after assisting the group with a rescue mission of novelist Mao Dun. Fang’s mother volunteers to take her place as a courier for a mission and is arrested. To save her mother, Fang finds herself turning to a childhood sweetheart, who now works at the Japanese occupation headquarters.

Wanted criminal “Helios” and his assistant stole a quantity of uranium and plan to produce weapons of mass destruction. They are planning to trade with a terrorist organization in Hong Kong. Chief Inspector Lee Yinming and Inspector Fan Kaming lead the Counter Terrorism Response Unit of the Hong Kong Police Force. Along with a Chinese senior official, a physics professor, and two South Korean weapon experts, they hope to defuse a crisis sufficient to destroy the world.