Prospero is introduced to us during the time of the red death
Prospero thinks that he and the nobles can beat the black death, so he decides to invite all of the nobles who are unaffected by the black death to the masquerade ball
When more guests start coming in, more and more attention starts shifting to the different color rooms in the home. The last room, the black and red room, was so disturbing to the guests that everyone steered away from it.
As the party continued, one guest came in that stole all the attention from the rooms. the guest appeared to be suffering from the red death
Prospero confronts the mysterious guest
The suspicious guest killed everyone at the masquerade ball