Edgar Allan Poe's 'The Cask of Amontillado' is a short story that explores themes of revenge and deceit. The story follows Montresor, who is deeply offended by Fortunato. Montresor devises a meticulous plan under the guise of cordiality, promising Fortunato a taste of a rare wine, Amontillado, during the carnival. The story unfolds in a tense and mysterious atmosphere.