During the period of 1930, Beijing, China, was a prosperous city with the reputation of "Shanghai, the oriental magic capital of China". Behind the prosperity, there are many complicated and incredible criminal cases. In the police station in the center of the concession, Gu Yuan, who has just been promoted to chief inspector, solved this bizarre mystery with the help of Su Wei, a well-known forensic car, and Kang, president of the First Chamber of Commerce in Shanghai.
Among them: sadomasochism in Mingdu; Blood-sucking events caused by the movie "Blood clan" broadcast in Hollywood, USA; Pursuing the ethics hidden in the courtyard door in the ultimate experience; A murderous maniac who can cause depression in the crowd; After the campus bullying incident, "please ask the gods" to retaliate; Feng shui puzzle that hurts the "earth vein"; China's first "Marathon" exploded. Behind this mystery, the hidden secret is also a confused heart under the changes of the times, just like you and me now. Finally, the central police department worked together to eliminate the reactionary forces hidden in the French Concession and protect the safety of one side's land.