Write a story that begins with a tragedy, but not a death.
The middle of the story should contain a climax where the main character sits face-to-face with their sworn enemy who is allegedly responsible for the tragedy.
The end of the first part of the story should show the main character resolving their conflict with their enemy.
That resolution creates another tragedy which would ultimately create another cycle of conflict, climax and resolution.
However, the story ends here.
The main character can relate to this new cycle in any way you see fit.