The second volume of *50 Masterpieces of Murder Mystery & Detective Fiction* charts the extraordinary breadth of crime writing, from Gothic unease and sensation fiction to analytic detection, espionage intrigue, psychological suspense, and tales touched by the supernatural. Its selection places celebrated investigations beside atmospheric crimes, impossible puzzles, urban mysteries, and narratives in which guilt, class, technology, and secrecy shape both plot and moral inquiry. Standout modes include the locked-room enigma, the gentleman-thief adventure, and the unsettling crime tale, revealing detective fiction as a capacious literary form rather than a mere exercise in solution. The contributors represent a transnational lineage spanning nineteenth-century Gothic and realist traditions, the Victorian sensation novel, fin-de-siècle decadence, the Golden Age puzzle, and early modern thriller writing. Figures associated with foundational detective traditions—including Poe, Collins, Doyle, Gaboriau, Leblanc, Christie, Sayers, and Van Dine—appear alongside novelists of social realism, adventure, fantasy, and psychological fiction. Their varied national and aesthetic backgrounds illuminate how murder mystery absorbed the pressures of modernity: expanding cities, imperial travel, professional policing, mass media, and anxieties about identity. Recommended for students, devotees of classic crime, and general readers alike, this volume offers an unusually rich comparative archive. It invites readers to trace recurring conventions across sharply different styles while appreciating the ethical, cultural, and formal questions that each mystery poses. Read together, these works create a vigorous dialogue between deduction and dread, entertainment and social observation.