"Twenty years have elapsed since the events of The Just City. The City, founded by the time-traveling goddess Pallas Athene, organized on the principles espoused in Plato's Republic and populated by people from all eras of human history, has now split into five cities, and low-level armed conflict between them is not unheard-of.
The god Apollo, living (by his own choice) a human life as "Pythias" in the City, his true identity known only to a few, is now married and the father of several children. But a tragic loss causes him to become consumed with the desire for revenge. Being Apollo, he goes handling it in a seemingly rational and systematic way, but it's evident, particularly to his precocious daughter Arete, that he is unhinged with grief.