Gothic fiction, which rose to prominence in the late eighteenth century with works like Horace Walpole's 'The Castle of Otranto,' is characterized by its use of gloomy settings, supernatural elements, and an overriding sense of dread. Often set in decaying castles or monasteries, these stories explored the dark side of the human psyche and the weight of the past. By the Victorian era, the genre had evolved into the 'Urban Gothic,' as writers like Charles Dickens and Robert Louis Stevenson shifted the setting from remote ruins to the fog-shrouded streets of London. In Stevenson's 'Strange Case of Dr. Jekyll and Mr. Hyde,' the duality of human nature is explored through the literal transformation of a respectable doctor into a monstrous alter ego. This reflected Victorian anxieties about the hidden impulses that lay beneath the surface of civilized society. While early Gothic fiction was often dismissed as sensationalist pulp, later iterations of the genre have been recognized for their psychological depth and their ability to critique social norms through the lens of the uncanny. The enduring appeal of the Gothic lies in its power to give form to the unnameable fears that haunt the collective imagination.