Plot
Whilst working for the CIA, Jackie is assigned to follow leads of a nuclear smuggling case. One of the tasks the CIA gives him is to watch a woman named Natasha while on a plane from Hong Kong to Crimea and record her movements. Jackie arrives in Simferopol and the CIA, partnered with local Ukrainian Security Service, take over the task of following Natasha. However, the CIA operation almost falls apart when the Ukrainian Strike Force arrest Natasha. However, Jackie spots Natasha being driven away and follows her.
During the chase in Yalta, Jackie discovers that Natasha is working with a partner, who called in the Strike Force to prevent her from being followed. Natasha and her partner are also romantically involved. Jackie decides to follow Natasha's partner to a remote lodge in the Crimean Mountains, and informs the CIA of his location. Natasha's partner is meeting with Russian mafia members who are interested in a nuclear bomb that is in his possession. The criminals eventually spot Jackie and agents of both the Ukrainian Militsiya and the CIA arriving. A gunfight ensues. During it, Natasha's partner is identified as Jackson Tsui, a Chinese-American nuclear scientist with CIA links, suspected of stealing a nuclear warhead.
Jackie finds a briefcase which contained evidence from Tsui. However, while being chased by mafia forces, Jackie loses the briefcase as he falls into frozen waters. The mafia takes the briefcase. While recovering in Russian military hospital, he meets Colonel Gregor Yegorov of the Russian FSB. Jackie goes with him to Moscow and discovers he has been assigned to work with Gregor to solve a similar case involving nuclear weapons being smuggled out of Ukraine. His task is to track Tsui, who disappeared after their last encounter. A Russian submarine smuggles Jackie into Brisbane, Australia.
To find out where Jackson is, Jackie befriends his younger sister Annie, who works at an aquarium doing shark shows. Jackie pretends to be Jackson's friend. Chan's deception is successful, and he eventually meets Uncle 7, the Tsuis' father and the local Triad boss. Uncle 7 is seriously ill and will be getting surgery soon. Jackie reveals the true nature of his visit to both Uncle 7 and Annie and informs them of Jackson's criminal activities. Unknown to Jackie, Jackson is hiding at the hospital and has given a nuclear warhead (disguised as a small oxygen tank) to Annie, who hides it at the aquarium.
While following Annie, Jackie gets held up by Jackson, who claims to have a deal with Gregor. He also reveals that Gregor has secretly put audio bugs in objects the FSB gave Jackie. After realizing he has been used by Gregor, Jackie decides to return home and write a full report to both of their superiors. Two men are sent to kill him, and he is framed for the murder of Uncle 7. He attempts to clear his name by going to see Annie at the memorial hall, but he is unwelcome, having to fight Allen and the family's bodyguards until Jackson arrives to clear Jackie's name. Jackson explains that Gregor caught him on a CIA assignment three years before, and forced him to turn into a triple agent: a CIA agent ostensibly turned by the FSB, but in reality serving Gregor's private criminal schemes.
Gregor uses the nuclear warheads to secure stakes in oil franchises in the Middle East. Jackson was trying to get money from Gregor for the warhead. However, after overhearing the conversation, Annie believes Jackie was right and blames Jackson for his wrongdoing behind her back. Annie, Jackie, and Jackson decide to work together to find Gregor and bring him in. Uncle 7's elaborate Chinatown funeral becomes the scene for a shootout between the various parties, injuring Jackson in the process. Annie and Jackie attempt to retrieve the stolen warhead from the shark pool (so that they can return it to the police), but Gregor and his men follow them, leading to a confrontation underwater. During it, Gregor shoots the aquarium tank and shatters the glass, which releases a great white shark into the restaurant area.
During the confusion, Gregor escapes with the warhead and kidnaps Annie to a getaway boat. Jackie saves the tourists from the shark and then pursues Gregor. While Gregor escapes in the getaway boat, Jackie finds and drives a display car onto the boat. The car pins Gregor, allowing Jackie to retrieve the warhead and save Annie as armed police close in. The Australian police apprehend Gregor and Jackson and turn them over to Russian authorities. Jackie is thanked for his work by the FSB and returns to his work in Hong Kong.
