What is the setting and plot of "The Pit and the Pendulum"? Who are the characters?

The setting takes place in an apartment, where the narrator sees the white judges for the first time. He is sentenced by them and then he suddenly blacks out. When he awakes, he is in a very dark place, also known as the pit. The pit is actually a dungeon, this is an example of Poe's symbolism. The pit is dark, deep, scary, and lonesome. The unusual thing about the pit is that there is an additional abyss inside the pit the narrator is already in. This gets the narrator thinking about his torture and his possible upcoming death. Like many of Poe's stories,"The Pit and the Pendulum" isnt much more than multiple macabre situations. The plot of this story is: the unknown narrator is imprisoned, then escapes torture three different times, and then is finally rescued by General Lasalle and the French Army.