''Powers'', the third book in Ursula Le Guin's ''Annals of the Western Shore'' series, is the story of Gavir. He is a slave in a fictional ancient civilisation. Whilst his owners largely treat him and the other slaves with more respect than most slave-owners would, events lead Gavir to change his mind, and he runs away. He traipses from place to place, trying to find somewhere that he fits in.