The Left Hand of Darkness is a science fiction novel written by Ursula K. Le Guin. Set on the planet Gethen, where the inhabitants are androgynous and can change their gender at will, the story follows a human envoy named Genly Ai who is sent to establish diplomatic relations. As Genly navigates the complex social and political landscape of Gethen, the book explores themes of gender, sexuality, and cultural differences. The Left Hand of Darkness is a thought-provoking and beautifully written exploration of humanity and the nature of identity.