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In 1941. Feng Jiusi, the young police officer working within the British Concession, witnessed the death of a member of the underground Chinese Communist Party and was unfortunately marked as a suspect by the CCP. Meanwhile, the Japanese were amid clearing the anti-Japanese factions in Tianjin as they prepared to take over the British-French concession. As an undercover CCP member in the police force, Feng Jiusi must prove his loyalty to the CCP as he works to uncover the plot of the Japanese.