In Shanghai in the 14th year of the Republic of China, undercurrents surged beneath the glitz, and countless mysteries and conspiracies lurked in the streets and alleys of the French Concession. Returning to her hometown with Zou Jing's determination to protect her country, she unexpectedly reunited with her old love Lu Yao at Paramount - the classmate with whom she had parted ways in Cambridge due to a misunderstanding.
At this time, Lu Yao has formed a detective partner with the police inspector Qiao Chusheng and the hot-blooded reporter Bai Youning, relying on his keen insight to solve strange cases repeatedly; Zou Jing also soon joined forces with his Cambridge schoolmate Su Man - Su Man now works at the Chinese Chamber of Commerce. The two not only have a friendship as classmates, but also share the goal of protecting Shanghai's industry and tranquility.
An unexpected intersection of cases brought Zou Jing, Lu Yao, Qiao Chusheng, Bai Youning, and Su Man to work together officially. From the disappearance case in the secret room of the bookstore, the theft of antique clocks involving gang grievances, to the serial mysteries hiding larger conspiracies, etc., They peeled off the cocoons and traced the truth in danger. During the investigation, Zou Jing and Lu Yao gradually solved their misunderstandings, and their old feelings sprouted again while fighting side by side; Qiao Chusheng and Su Man protected each other, and Bai Youning used his pen as a blade to expose the darkness.
The five people not only have to fight against the criminal forces in the dark, but also protect a corner of Shanghai's tranquility in the turbulent situation. Using wisdom as a blade and friendship as a shield, they lit up the glimmer of light in the fog of the Republic of China and wrote their justice and responsibility for the country with their actions.
