In the Cask of Amontillado by Edgar Allan Poe, he shows how one can betray someone by acting fake and then surprising and tricking him. One of the most imminent themes in this book is betrayal and artificial personalities. The books shows how someone can wear one personality or mask and then change it and put on another mask to betray or trick another person.

The author shows this theme by having Montresor (the narrator) act friendly and inviting towards Fortunato and then tricking him by chaining him up and sealing a compartment in his dungeon so Fortunato could slowly die. When he suddenly tricks Fortunato, he also puts on a new personality and his whole character instantly changes.

The author uses irony to reinforce the theme and he uses irony by letting the author know what is going on inside Montresors head and behind the mask he...