"The Left Hand of Darkness" is a science fiction novel by Ursula K. Le Guin, published in 1969. The story is set on the planet Gethen, where the inhabitants are ambisexual, meaning they can change gender. The narrative follows Genly Ai, an envoy from the Ekumen, who is sent to persuade Gethen to join a coalition of planets. As Genly navigates the complex political landscape, he forms a bond with Estraven, a Gethenian politician. Their journey across the icy terrain of Gethen explores themes of gender, friendship, and the nature of humanity, challenging traditional notions of identity and society.