In 1939, the occupied areas of Shanghai were peaceful on the surface, but secretly Japanese and puppet spies, military commanders, and the CCP's underground communication lines were strangled with each other. Intelligence decided who could survive until dawn before guns. The male protagonist was originally the young owner of a photo studio in the French Concession, but because his father disappeared, his mother was seriously ill, and his sister was targeted, he was forced to get involved in a battle for Japanese defense intelligence that could change the situation of the Songhu War. The heroine is a famous campus beauty of Hujiang University and an all-round underground worker who is proficient in telecommunications, medical care, foreign languages and disguise. She is not only an old acquaintance of the hero, but also the most difficult person to see through. The entire story revolves around the two lines of "whether the family can be saved" and "the information must be sent out". Family has become the protagonist's deepest weakness and the reason for his constant counterattack.
