What is the plot of Edgar Allan Poe's short story, "The Cask of Amontillado"?

Edgar Allan Poe's short story masterpiece, "The Cask of
Amontillado," takes place at an undetermined locale and date; an educated guess would
place the setting as somewhere in Italy in the late 18th century. Montresor (presumably
a Frenchman), has been the subject of "a thousand injuries"--and more recently,
insults--by an acquaintance, Fortunato, and Montresor has vowed revenge. In doing so,
Montresor's act must not be detected and Fortunato must be aware that Montresor is his
punisher. Taking great precautions not to have witnesses around, Montresor lures
Fortunato into his family catacombs, which doubles as a wine cellar, under the pretense
that a rare bottle of Spanish sherry, Amontillado, awaits. Knowing that Fortunato cannot
resist the temptation of sampling such a vintage, Montresor leads him deeper and deeper
into the catacombs. Reaching a far recess, Montresor suddenly produces a chain and
fetters Fortunato to the floor. Using a trowel and mortar, Montresor then builds a wall,
sealing the stunned Fortunato within, and he leaves him to die among the bones of the
crypt. Montresor, the narrator, ends the story by telling the reader that Fortunato's
bones have been undisturbed for a half century. Montresor has committed the perfect
crime.