In the short story, "The Cask of Amontillado," the reader is never told what the exact insult was that caused Montresor to seek revenge against Fortunato. Write to tell what happened before the story begins in "The Cask of Amontillado."
or
In the short story, "The Cask of Amontillado," the reader is never told what becomes of Montresor after he completes his plot against Fortunato. Write to tell what happened after the story ends in "The Cask of Amontillado."