In the rain alleys of the French Concession in Shanghai, there is a crisis more poignant than the cold rain - the Japanese army is about to raid the underground transportation station, and the lives of twenty comrades hang on by a thread. CCP agent Xu Xiaozhi (codename "Nightingale") disguised as a bank consultant, tried for the third time to pass information with the mysterious contact "Scavenger"; and the pseudo-government translator Shen Muchen was the "Scavenger" who held the Japanese military's operational codes and had hidden patriotism. From the "Blue Mountain" code in the cafe to handing over the secret code potion and pearl code paper in the bookstore, the two men worked step by step under the supervision of Japanese spies. When Xiao Lin, the deputy of the Special High School, suddenly appeared, Shen Muchen held Xu Xiaozhi's arm and pretended to be intimate. Xu Xiaozhi threw out a bait to divert attention, and finally saved the day. Late night radio transmissions and continuous deciphering under the light, they used their flesh and blood to build a defense line in the secret war of the spy sea, becoming the glimmer of light guarding the world in troubled times.
