Answer:
Bookends.
Explanation:
If an author chooses to begin his story with a narrative or a scene which seems to achieve its own plot at the very end of the book it can be qualified as a bookends technique.
The bookends technique serves to assure unity of a written work. It somewhat encloses the story and therefore attributes to the work a quality of having a circular composition. This is a more general term by which the story ends the way it began, leaving the impression of a narrative's never-ending flow.
