In Shanghai during the Republic of China, bizarre murders occurred frequently in a century-old mansion, and the victims were all related to family secrets from ten years ago. Gu Manqing, a female detective who returned from studying abroad, was ordered to go deep into an old mansion with many agencies to investigate the case. However, she unexpectedly met Lu Shiyan, a warlord marshal who was investigating the theft of arms. From tit-for-tat to tacit cooperation, the two gradually discovered that there was a conspiracy of a huge underground organization behind the murder and arms cases. The love between life and death and communism secretly arises. The two work together to uncover the truth, destroy the organization, and protect the tranquility of Shanghai. However, the storm has calmed down, the shadow of the southern forces has quietly shrouded, and a new crisis is approaching.
