In the early years of the Republic of Shanghai. Housewife Gou auspicious misfortune, her husband died, her wronged. In order to find out the cause of her husband's death is also his innocence, good luck to become a female agent. Mao Ruyi is a good partner, a good hearted, but arrogant. To solve the case, they make a lot of contradictions. With the deepening of cooperation, they gradually understanding, wore patrol long Frank pressure cracked the mystery, not only let the wicked be punished, more help many of the underlying the poor people. Auspicious by the loss of self transformation of housewives into confidence in independent new woman, Ru Yi also by the unexamined gongzige become responsible brave detective. Two people harvest love at the same time, also understand the meaning of life: to help more people in need of help. Auspicious and Ru Yi in the case, recognize the imperialist colonizer's true colors, to expose the frank and profiteers blockbuster conspiracy. They left the police station, opened a special service for the people of the auspicious detective agency, with the youth and blood writing justice.