I found this story to be quite interesting. It follows a young high school boy when everything in the world slightly changes. Everyone is similar to who he knows but not quite. People are not the same, but are being replaced by other with similar looks and background. It becomes clear that everyone is somehow shifting around in parallel worlds. Everyone else is experiencing the same thing and if you look away for a few seconds everything shifts again. The boy manages to stay together with a man resembling his father – as long as they keep watching each other.
In this world breaking event society doesn’t quite break down but everyone is struggling with this new unexplained world shifting. In typical Egan style people start to work on the problem in a logical, methodical and scientific manner. Testing various things to see what makes people able stay together, how to communicate across worlds or test if the process can be stopped by video recording.
What I think Egan is going for here is to comment on whether society will descend into anarchy or solidarity in the event of a global crisis. Egan is somewhat mostly in the positive camp here, which is a nice change from all dystopian stories.
Read in Asimov’s September/October 2022