I've never read a science fiction book that is more subtly packed with philosophy than this one. Le Guin takes on political theory, economics, and gender roles all at once, and even bats around at Einstein's General Theory of Relativity. The story follows Shevek, an ambassador from an anarchist moon colony returning to the egalitarian world that his ancestors once turned away from. Over the course of the novel we see him evolve as a philosopher, a physicist, a diplomat, a lover, and a revolutionary. With The Dispossessed, Le Guin manages to achieve what is in my mind the ultimate goal of science fiction: to give us a story about a speculative world that enables the blossoming of ideas about our own world.