A modern science fiction classic whose influence is hard to overstate, Le Guin's novel is set in her Hainish future, in which different branches of humanity are reconnecting after millennia spent developing on different planets. The Left Hand of Darkness follows the first official contact between the Ekumen—a loose government of many worlds—and the people of Gethen. Gethenians have developed on a world in the grip of an ice age, and differ from the rest of the Ekumen in their social and biological sexual natures.
Sex and gender exploration is kind of the big-ticket draw of The Left Hand, but it's also brilliantly-written, packed full of profundity, and unusual (for science fiction) in how much it comes down to a deeply-drawn relationship between two people.
Also, it's very appropriate for a January Chicago reading, involving as it does great treks across the ice and snow. Notes and possible spoilers below:
