How does the mood in The Cask of Amontillad change as the story unfolds?How does the mood in The Cask of Amontillado change as the story unfolds?

Even though the first paragraph hints at trouble, the
intensity of the mood increases with each paragraph. A wine cellar in the basement was
normal, but this wine cellar was below the basement in the catacombs of the Montresors.
The spider webs and nitre hanging from the walls added a macabre touch. Montresor used
false sympathy, offering to turn back because of Fortunado's cough, to lure Fortunado
onward to his doom. When Montresor produced a trowel from his cloak, the poor, drunken
Fortunado still did not catch on. A niche in the wall with shackles and bricks with
mortar compound still did not penetrate his stupor. Only when Fortunado was shackled to
the wall did he begin to catch on. Hoping he was wrong, Fortunado laughed about the
splendid joke. Only joke, it was not. The jingling of bells and shackles as Montresor
worked allowed the reader to realize the horror of his slow death in the darkness. The
final plea "For the love of God" was only mocked by his soon to be
murderer.