How does the setting of the cask of amontillado affect the impact of the story as a whole

The setting impacts the plot by the use of morbid imagery and tone as well as the demeanor of the characters. The mood of the story is one of impending doom  and suspense. The setting impacts the mood with the dark imagery and morbid symbolism used throughout.

Explanation:

(above)

its everything except for telling nonfiction and using first person

because they were not just any seashells they were sally's seashells