A best-seller in its day and a potent influence on Sade, Poe, and other purveyors of eighteenth and nineteenth-century Gothic horror, The Mysteries of Udolpho remains one of the most important works in the history of European fiction. After Emily St. Aubuert is imprisoned by her evil guardian, Count Montoni, in his gloomy medieval fortress in the Appenines, terror becomes the order of the day. With its dream-like plot and hallucinatory rendering of its characters' psychological states, The Mysteries of Udolpho is a fascinating challenge to contemporary readers.