And Then There Were (N - One)

A quantomologist who discovers how to access parallel universes arranges a convention for attendees who are all versions of herself from slightly divergent universes.

This murder mystery novella uses a format familiar to many SFF fans - a convention with keynote speeches and panels on relevant subjects of interest - to provide the setting for an exploration of the theme in Frost's Road Not Taken. It's a powerful metafictional musing on choices and consequences and what's most important in life - and how one's priorities can change, depending on the results of previous choices. I loved it. This is definitely going on my Hugo Novella ballot.