In the spring of 1939, Shanghai became an isolated island. Shen Lian, the military's ace agent "Blue Bird", was stigmatized as a traitor and was ordered to sneak behind enemy lines to implement the "Mole Plan." In the concession where neon lights and gunpowder smoke intersect, he must find the latest German encryption machine that can change the direction of the war amid heavy surveillance from the Japanese Special High School, Wang Puppet No. 76, The underground party and the military command. Trust is a luxury, and behind every smile there may be a gun. Tonight, he will walk into the dance floor of Paramount, where there are comrades waiting for a connection, and there are also traps laid for him.
