The central theme of The cask of Amontillado is " revenge":
Explanation:
The Cask of Amontillado" is a short story by Edgar Allan Poe (1809-1849), an American writer, editor, and literary critic.
It is a short story of a man called Montresor. His strong desire is a revenge against Fortunato, a man who had abused him. Fortunato should die because Montresor couldn't accept an affront without a punishment.