The Left Hand of Darkness by Ursula K. Le Guin
The Left Hand of Darkness takes place in the future on an icy planet called Winter. It follows Ai, an envoy from Terra (or Earth) and Estraven, the former Prime Minister of Karhide. Ai’s mission is to persuade the citizens of Winter (also called Gethen) to join the Ekumen, an alliance of other known planets. […]