The Left Hand of Darkness is a science fiction novel written by Ursula K. Le Guin. It takes place on the planet Gethen, where the inhabitants have no fixed gender. The story follows a human envoy named Genly Ai as he navigates the complex politics and cultural differences of Gethen. The Left Hand of Darkness explores themes of gender, identity, and the nature of humanity. It is considered a groundbreaking work in the genre of alien technology science fiction.