Masterpieces of Mystery (Vol. 1-4) surveys the extraordinary breadth of nineteenth- and early twentieth-century mystery writing, moving among analytic detection, Gothic terror, psychological unease, fantastic speculation, and the macabre tale. Its selections reveal mystery as a flexible literary mode rather than a fixed genre: rational inquiry coexists with haunting, crime with moral ambiguity, and sensation with satire. Standout examples of locked-room ingenuity, spectral visitation, inherited secrets, and uncanny reversals demonstrate how suspense can interrogate perception, evidence, and social order. The volume's contributors form a transnational constellation of British, American, French, Russian, and classical writers whose careers helped establish both the detective story and the modern supernatural narrative. Their varied traditions-from Gothic romance and sensation fiction to realism, Decadence, journalism, and popular crime literature-bring distinct cultural assumptions to questions of guilt, knowledge, and the unknown. Canonical innovators appear beside less frequently anthologized practitioners, allowing the collection to trace the mutual development of literary horror and detection across languages and markets. Recommended for students, scholars, and devoted readers of crime and fantastic fiction, this four-volume gathering offers an unusually rich comparative archive. It invites readers to follow recurring motifs across divergent styles while appreciating each tale's formal precision, historical resonance, and imaginative power.