In 1939, Shanghai had become an isolated island. There was heavy artillery fire outside the concession, and undercurrents were raging inside the concession. In an inconspicuous second-hand bookstore, a young clerk wipes the bookshelves, organizes old books, and nods and bows to each customer every day. No one knew that this young man, who always lowered his head, was using the oldest method to deliver the most deadly information. When the eagle dogs of the Japanese military special high school smell the scent, and when the old-fashioned printing press in the backyard of the bookstore rings late at night, the war of the unknown begins quietly with the rustling of books.
