Book Log 2020 #50: The Last Emperox by John Scalzi

With the Flow, the pathways that allowed the planets of the Interdependency to stay connected, continuing to dissipate, Emperor Grayland II has to figure out how to best save the billions of people who will become effectively cut off from other humans once it finally disappears. She has to do this while fending off threats to her crown (and her life) from powerful noble families who want to squeeze every last dollar out of the interstellar trade the Flow allows.

This is a fitting end to the trilogy, though I would have liked to spend more time in this universe. After getting another Lock In universe novel, though.