In Hong Kong, the Paper Sisters—Anita King, Maggie Mui, and Michelle Cheung—operate the Three Sisters Detective Agency specializing in book-related cases. When hired to assist Japanese novelist Nenene Sumiregawa, who is grappling with writer's block after her friend's vanishing, the sisters, all Paper Masters with paper-controlling abilities, shield Nenene from terrorists at a book signing. Despite differing views on books, they become Nenene's protectors, delving into mysteries tied to her past and the enigmatic Dokusensha organization. As they navigate their dual roles in Japan, the sisters uncover unsettling truths linking Nenene, her missing friend, and Dokusensha's cryptic literary involvements, turning a simple task into a perilous journey that challenges their dedication to the written word.