The narrator of "The Cask of Amontillado" is Montresor, who claims to have suffered many times, greatly but quietly, at the hands of Fortunato. Finally, he resolves to seek revenge on Fortunato when he hears that Fortunato has laughed at his “proud name Montresor, the name of an old and honored family”.
Montresor, the narrator, then plots his revenge, which he intends to exact as secretly as possible so that nobody can trace it back to him. Knowing that Fortunato likes wine, he decides to use this against him. He invites Fortunato to his home one dark spring evening to taste a cask of wine that is supposedly amontillado. The visit is well planned so that none of the servants witness the occurrence. Also, Fortunato is quite drunk on the given day. Montresor walks Fortunato to the wine vaults that are situated beneath the walls of the palace and also house the tombs of the Montresor family. While they walk, Montresor offers Fortunato more bottles of wine to drink. Finally, towards the end of the vaults, he chains Fortunato to the walls and plasters him up. He buries Fortunato alive in the vaults under his palace, thereby exacting his revenge.
The character of the narrator comes through as cold, calculating, and vicious. He has no qualms about divulging the gory details of his revenge towards the end of the story. In fact, he appears to relish the wicked narration. This might mean that he thinks that he is justified in punishing Fortunato in this manner.