In the twenty-first year of the Republic of China, winter 1932, Shanghai. The war in Songhu had just ended, the Chinese border was devastated, the concession was peaceful with singing and dancing, and the ten-mile foreign market was divided into two worlds. The foreign policemen hold real power, the Chinese police station is extremely corrupt, the Green Gang and the Red Gang occupy the streets, and the wealthy mansions are full of filth. In troubled times, the law is ineffective, and people's hearts are darker than the night. Heavy fog has shrouded the banks of the Huangpu River all year round. The thick fog can cover the streets, but it cannot cover the numerous crimes hidden under the bustling city.
