In Shanghai in 1941, various forces were intertwined. Former patrol officer Lu Chenzhou (who possesses the unique skill of "ink shadow") retired to work as a watch repairman due to the death of his best friend Chen Mo.
Su Manqing, an underground party member of the Communist Party of China, used the top card of Paramount as a cover to search for key intelligence "Beidou Secret Map".
Wang Puppet No. 76 Operations Director Gu Mingyuan, Japanese hardline staff Chiyoko, opportunistic Green Gang Jin Ye, and French Concession undercover detective Zhao Feng and other forces launched a desperate struggle around the secret map, the "Yangtze River Defense Map" and the "Jingzhe List".
Lu Chenzhou returned to the world to find out the truth about his best friend, and he and Su Manqing went from testing each other to fighting side by side. They experienced life and death in setting up traps at cocktail parties, mercenaries at the docks, breakouts in slums, and train robberies.
In the end, they revealed the Japanese army's conspiracy to attack the concession and successfully passed on the information. Lu Chenzhou fought a decisive battle with Chiyoko at Paramount. Although he won miserably, he also made a huge sacrifice.
