The Power of Darkness assembles more than 560 supernatural thrillers, macabre tales, and eerie mysteries into an expansive map of literary unease. Ranging from Gothic romance, ghost story, and sensation fiction to psychological horror, weird fiction, fantasy, satire, and proto-science fiction, the volume traces darkness through haunted houses, doubles, curses, revenants, occult experiments, and inexplicable crimes. Canonical Gothic atmospheres stand beside concise shocks and elaborate mysteries, revealing how terror repeatedly tests the limits of reason, morality, and perception. Its contributors span eighteenth-century Gothic pioneers, nineteenth-century British, American, French, German, and Russian storytellers, and early twentieth-century practitioners of the weird tale. Novelists associated with realism, adventure fiction, social criticism, children's literature, and detective narrative join major architects of the supernatural tradition. This breadth situates the anthology at the intersection of Romanticism, Victorian sensation and Spiritualism, fin-de-siècle decadence, colonial encounter, and modern horror, showing how varied cultural anxieties assume spectral form. Recommended for students, scholars, and devoted readers of the uncanny, this capacious collection offers an exceptional opportunity to compare forms, periods, and national traditions within one volume. Its juxtapositions invite readers to follow a sustained dialogue between terror and humor, rational inquiry and occult possibility, intimate dread and social fear. It is both a rich educational resource and a compelling invitation to explore the enduring literary power of darkness.