In July 1937, the heroine Shen Lanling, a female boss of a cloth shop, was forced to marry the man who was a business tycoon in the French Concession in Shanghai at the time because her younger brother was caught and threatened by the military commander, that is, the male protagonist Zhang Hanzhou. As the third wife, a dual drama of house fighting and espionage began. On the surface, Zhang Hanzhou looks like an old fox traveling in business wars, but he is actually a liaison of the underground party. Later, the Battle of Songhu broke out. Because of the cruel reality, Shen Lanling's patriotic feelings were sublimated, and she decided to join the organization and fight with everyone as an underground party, because at this time, her younger brother had been rescued and was no longer threatened. She is very easy to do a series of things that Shen Lanling never dared to think about, such as rescuing comrades and sending information. Because of the special status of the other two wives of the Zhang family, the so-called house fight is actually an overt and covert struggle between various forces. After testing each other with the male protagonist, the two discovered that they were kindred spirits. After the complete fall of Shanghai, the two were instructed by their superiors to continue lurking. During this period, they experienced the cruelty of battle and the triviality of life until the final light came.
