During the Carnival, Montressor finds an extremely drunk Fortunato. He says that he was on his way to Luchresi to ask him about some Amontillado. Fortunato is surprised he managed to get some during a carnival. He claims that "Luchresi, ...cannot distinguish Sherry from Amontillado." (Poe 14), and insists that he does the tasting.
Despite his warnings that "The vaults are insufferably damp. They are encrusted with nitre." (Poe 21), Fortunato happily follows Montressor into the vaults. Suffering from a cold, Forunato continues to press forward by drinking more wine. Montressor continues to use reverse psychology to lure him further down by saying that Fortunato should go back. Fortunato continues following not knowing that it is a trap.
The two continue forward when Montressor points out the nitre growing on the walls. Fortunato takes another swig of wine before throwing his hands in the air. Montressor questions the action when Fortunato said only masons would understand. Montressor replies by stating that he is a Mason which serves as a form of foreshadowing later on. Eventually they arrive at room at the end of the crypt.
Once they arrive, Fortunato steps in oblivious to the fact that it is a trap. Montressor takes this opportunity to chain Forunato to the wall. Too shocked to resist Fortunato cries out about the Amontillado. He soon realizes that it was a trap as he comes out of his drunken stupor.
Montressor uncovers some stone and mortar and quickly begins sealing the entrance. Fortunato, now completely over the effects of intoxication begins to cry out and scream. He begins to laugh as if he is desperate for Montressor to say it's a joke but eventually gives up. They have a brief final conversation as Montressor lays down the final layer of bricks.
Montressor notices Fortunato go silent so he checks on him one final time. We find out Fortunato died when the only sound in response was the jingling of his bells. Montressor covers up the wall and leaves. The story concludes with Montressor declaring "In pace requiescat!" (Poe 89). He claims that nobody disturbed them for 50 years.