A genre of literature that involves narratives revolving around unexplained events, puzzles, or crimes, often utilizing elements of suspense or thrill. This category can intersect with science, presenting scientific concepts and theories as central to the plot's intrigue. Additionally, it can encompass autobiographies and biographies, detailing real-life mysteries from an individual's life or historical events. As a broader term, it is a subcategory of books, indicating its medium of expression.