As the financial center of Asia, Hong Kong is known as the "safest city". Unexpectedly, the police station received an anonymous call, claiming that a front-line assault vehicle of the police force and five police officers and weapons and equipment in the car were hijacked. This incident attracted great attention from the top leaders of the Hong Kong police force. It happened that the Commissioner (played by Michael Wong) was visiting abroad. At this time, the hawkish Deputy Commissioner of Operations Li Wenbin (played by Tony Leung) and the young Deputy Commissioner of Management Liu Jiehui (played by Aaron Kwok) were in charge of this case together, and named the operation "Cold War", with Li Wenbin as the commander-in-chief. Li Wenbin's son (played by Eddie Peng) was also one of the hostages, so Liu Jiehui became suspicious of Li Wenbin and his son. At the same time, the gangsters launched further actions: police were killed, bombings occurred frequently... Who is playing the entire police force in the palm of their hands? Is Hong Kong really the "safest city"?