This category encompasses literary works characterized by a suspenseful, puzzling, or mysterious storyline. It includes publications intended for children, offering age-appropriate narratives that stimulate their curiosity and problem-solving skills. In addition, this category also features memoirs that involve mysterious elements or unsolved aspects in the author's life. It represents a broad section of the literary world where the central theme revolves around the unknown, promoting intrigue and encouraging the reader to solve the presented mystery.