Denouement

[ dey-noo-mahn ]

noun

1. the ending of a literary work, musical composition, or a sequence of actions

Examples of denouement in a sentence:

• In a sad denouement to a perfect love story, the groom left the bride at the altar.  
• While I do not want to ruin the story for you, you should know the hero’s brother dies in the denouement.