The setting is the Republic of China, and the location is Shanghai. At that time, Shanghai was very chaotic, and there were many murders. The protagonist is Lin Yi, a calm, 30-year-old, unmarried, forensic doctor who came back from the UK. He is proficient in anatomy, fighting, and firearms. He stayed at Scotland Yard for three years and solved many cases. He is Sherlock Holmes's little fan, assistant Han Xiao, a Handsome B, Lin Yi's classmate, has impeccable surgery but loves to cynicize. The two of them felt that the Chinese were discriminated against in the UK, so they decided to return to Shanghai during the Republic of China to open a detective agency. So the story begins. They solved one strange case after another. At the same time, they also witnessed the Japanese invasion of China and participated in the process of resisting Japan! —I would like to pay tribute to the 80th anniversary of the victory of the Anti-Japanese War with this book!