The Left Hand of Darkness is a science fiction novel written by Ursula K. Le Guin. Set in a distant future on the planet Gethen, which is inhabited by androgynous beings, the story follows a human envoy named Genly Ai who is sent to establish diplomatic relations. The Left Hand of Darkness explores themes of gender, sexuality, and cultural differences. It is praised for its thought-provoking exploration of social and political issues, as well as its lyrical prose.