Left Hand of Darkness is about a man named Genly Ai who’s sent to the planet of Gethen to convince its people to join a planetary confederation. However, he finds himself unable to do so, due to his ignorance of the planet’s culture. Gethenians are ambisexual, with no fixed gender identity. They will assume one genre for reproductive purposes for a small period of time (the 'Kemmer'.)
The book was much more than the sexuality of the Gethenians; the political issues were quite important.
The 87-year-old author will serve as a consulting producer on the project.