In the twenty-sixth year of the Republic of China, Shanghai was in a storm. Shen Qingci, the female shopkeeper of the "Zhiwei Bookstore" on Fuzhou Road, is an elegant scholar who collates ancient books and quietly maintains the fragrance of books. However, secretly, she has the dual identities of "Bookmark", a military reunification agent, and "Mohen", an underground party member of the Chinese Communist Party, operating under the eyes of the Japanese military's special high school.
Taking advantage of the opportunity to find an orphan copy, she stole the "Pufferfish Project" film related to the Songhu War situation from the study of the Japanese military section chief, and hid it in the middle of the pages of "Selected Works of Zhaoming". However, her whereabouts were exposed during the evacuation, and she was frantically pursued by the spies. While running on a rainy night, she mistakenly broke into the "Qingya Tea House", a temporary contact point shared by the military commander and the underground party, and met the unidentified spy Leng Rui.
The pages of the book are sharp, the pen and ink are the blades, and the discussion of books and Taoism is full of life and death temptations. The dual identity hangs like a sharp knife, and the Japanese army pursues them step by step. Shen Qingci must not only keep the film and the secret messages from the underground party printing point, but also survive in a confusing situation where it is difficult to distinguish between friends and foes. In the chaotic world of books, she used the bookstore as a shield and words as a code. In the intertwining of the shadows of swords and the fragrance of paper and ink, she embarked on a thrilling secret war.
