The people had locked the gates and isolated themselves from the outside world due to the plague. They are enjoying themselves at a party. "they retired to the deep seclusion of one of one of the castellated abbeys"
Conflict: Everyone in the outside world is dying from the "Red Death." "The red death had long devastated the country"
Rising Action: Everyone at the party is having fun, not getting sick from the disease, inside the safety of the gates. " but in spite of these things it was a gay and magnificent revel"
Climax: The "Red Death" shows up at the party and everyone is very frightened. " there was a slight rushing movement of this group in the direction of the intruder"
Falling Action: Everyone at the Masquerade is suspisous and frightened of the Stranger when he shows up. "While none followed him on account of a deadly terror that had seized upon all"
Resolution: Everyone dies from the Red Death even after they tried protecting themselves "One by one dropped the revellers in the blood-bedewed halls".