In 1931, due to betrayal by traitors, the party's underground organization in Shanghai was severely damaged, and the revolutionary cause fell into white terror. Ma Tian Mu, a young party member who was injured in the Northern Expedition was ordered to go to France. Under the guidance of his superior Wu Zhong Xin and the cooperation of comrades, he walked among all kinds of bureaucratic gentry and police gangs. (Source: Baidu)