The Left Hand of Darkness is a science fiction novel by Ursula K. Le Guin. It takes place on the planet of Gethen, where the inhabitants are androgynous and can change their gender at will. The story follows a human envoy named Genly Ai as he navigates the complex politics and cultural differences of this alien world. The Left Hand of Darkness is a groundbreaking work that explores themes of gender, identity, and the nature of humanity.