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The captain of the Security Bureau Reconnaissance Team, Liu Zhijun, unexpectedly discovered that the spy codenamed Leopard was trying to smuggle out the design plan of the Xingxun 6 satellite during a capture operation. After receiving instructions from the central government, the Confidentiality Bureau collaborated with the Security Bureau and the Public Security Bureau to establish a special investigation team, led by Director Wu Mei of the Supervision Department of the Confidentiality Bureau. The investigation team conducted an investigation into the satellite research and development institution but encountered numerous obstacles with little progress. Meanwhile, foreign spy organizations launched cyber attacks on the network.

With the help of Shen Weiguo and his son, the investigation team successfully uncovered the hidden spy Fang Yao within the organization. Wu Mei intended to follow the lead to uncover the mastermind behind the spy organization, Silver Fox, but instead fell into a trap set by Silver Fox. Fang Yao was killed by the assassin Butterfly, and the clue suddenly broke off as Butterfly escaped to Bin Yang, where she was met by Lin Xiaolian, a long-term dormant spy in Bin Yang. Lin Xiaolian's mission was to sabotage the Bin Yang Satellite Telemetry and Control Experimental Base Station, but the pursuit of Butterfly by the investigation team disrupted his plans.

Spy Liu Peng died in a car accident during the chase. In desperation, Lin Xiaolian pulled Secretary Tong Yifan of the Municipal Party Committee into the mess. With Tong Yifan's help, Butterfly entered the station but was discovered by Qin Feng of the Bin Yang Security Bureau. In a life-and-death struggle, Qin Feng was unfortunately martyred, and Butterfly was also shot dead. Unable to bear the guilt, Tong Yifan confessed voluntarily. Lin Xiaolian, who was about to leave the country, was brought to justice.

As the spy organization's actions were repeatedly frustrated, Silver Fox could only make a desperate last stand by launching a final attack on Aerospace Institute No. 19. The security captain of Institute No. 19, Luo Bing, became a tool used by the spies. Wu Mei infiltrated Institute No. 19 through Pang Jian to catch Silver Fox. A covert war quietly began.

After both sets of Silver Fox's espionage plans failed, he kidnapped Wu Mei's daughter Tingting, threatening Chief Engineer Zhou Xu to exchange core secrets for her life. Facing the threat to national interests and her daughter's safety, Wu Mei stepped forward to engage in the final showdown with Silver Fox.

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