In the late autumn of 1941, the occupied area of Shanghai (the isolated island period ended and the Japanese and puppet forces took full control). All forces are intertwined: the high-pressure rule of the Japanese Gendarmerie and the Wang Puppet Secret Service Headquarters "No. 76"; The activities of hidden personnel of the Kuomintang Military Command and the Central Command; the underground party organizations of the Communist Party of China persist in fighting in extremely harsh environments; gangs such as the Qinggang and Hongmen take advantage of the situation; although the concession exists in name only, the remaining foreign forces still have influence; ordinary citizens are trying to survive in the cracks.
