In "The Cask of Amontillado," Edgar Allan Poe creates tension out of his use of dramatic irony. In the story's very beginning, his narrator, Montresor, vows vengeance against Fortunato, giving the reader insight into his motivations. Yet Fortunato himself remains ignorant of Montresor's designs, continuing to trust in him even as he is brought deeper into his enemy's web.
I would suggest that this tension is key in Poe's creation of suspense. With that being said, however, keep in mind that Poe does not reveal everything to his readers right away. While Montresor's malice is clearly expressed throughout text, the specific details concerning his vengeance are withheld until the end. This only creates further tension in the story. We can assume Montresor plans to exact some monstrous revenge against Fortunato, but we don't necessarily know what that revenge entails.
Poe sets the suspenseful mood of the story by establishing the conflict in the story's first line, in which Montresor announces...
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