At a nuclear plant in Chai Wan, Hong Kong, a hacker causes the coolant pumps to overheat and explode. Not long after in Chicago, the Mercantile Trade Exchange gets hacked, causing soy futures to rise. The Chinese government and the FBI determine that the hack was caused by a Remote Access Tool (RAT). A military officer in China’s cyber warfare unit, Captain Chen Dawai (Leehom Wang), is tasked to find the people responsible for the attacks, and enlists the aid of his sister Chen Lien (Tang Wei), a networking engineer. He meets with Agent Carol Barrett (Viola Davis) of the FBI in Los Angeles and reveals the code in the RAT was written by himself and Nicholas Hathaway (Chris Hemsworth), his college roommate. Dawai asks that the FBI arrange for Hathaway to be released from prison, where he is serving a sentence for computer crimes. Hathaway is offered temporary release in exchange for his services. A dead colleague’s computer yields a clue to a connection, so Hathaway and Lien go to the rendezvous but it is a trap set by the hacker to alert him to pursuit. Hathaway fights three men. In Hong Kong, the team traces the stock trade money to a known paramilitary named Kassar. A stakeout team is murdered while Hathaway, Jessup, Chen, Trang along with a Special Duties Unit team raid Kassar’s hideout but once again it is a trap. A shootout ensues and Trang as well as a number of SDU officers are killed. Kassar and his men escape. The nuclear plant has stabilized enough to retrieve a data drive from the control room but it is corrupted. Agent Barrett turns a blind eye while Hathaway hacks into the NSA to use a classified data tool called Black Widow to reconstruct the corrupted data. He learns that the hacker’s server is based in Jakarta. Lien finds out the hacker has been buying satellite photos of a remote site in Perak, Malaysia. Hathaway’s hack into the NSA does not go unnoticed and the US government demands his return to prison. Dawai’s superiors agree as they do not want to antagonize the US, while Barrett and her partner Agent Jessup receive orders to detain Hathaway. Dawai, Lien and Hathaway manage to elude their pursuers and make plans to leave Hong Kong and continue their investigation when they are attacked by Kassar and his men, who have been following them.
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