The Left Hand of Darkness is a science fiction novel written by Ursula K. Le Guin. Set on the planet of Gethen, it follows the story of Genly Ai, an envoy from Earth who is sent to establish diplomatic relations with the inhabitants. Gethenians are unique in that they have no fixed gender, and can become either male or female during their monthly reproductive cycle. As Genly navigates the complex social and political landscape of Gethen, he uncovers deep-rooted mysteries and challenges his own assumptions about gender and identity. The Left Hand of Darkness is a groundbreaking work of science fiction that explores themes of gender, sexuality, and cultural differences.