Poe's short fiction and poetry define American Gothic literature, blending psychological torment with meticulous atmosphere. His protagonists often descend into madness or moral dissolution, driven by guilt, obsession, or inexplicable impulses, whilst the narrator's unreliability keeps readers questioning what is real. Poe excelled at confined, claustrophobic settings—locked chambers, premature burial, decaying mansions—where tension builds through suggestion rather than explicit description. His influence on detective fiction and horror remains unmatched. Readers new to classic horror should start with Poe for his masterful control of mood, psychological complexity, and innovative narrative techniques.