The Left Hand of Darkness

The Left Hand of Darkness by Ursula K. Le Guin is the 4th book of the series Hainish Cycle.
Each book explores a new planet colony started by the Hainish people as an evolutionary experiment.
All books of the series can be read as standalone.
This one explores the planet Gethen, and the experience of the human envoy sent there on a mission.

Honestly, this book is what you'd expect after reading the blurb description.

I am definitely going to add more books by the author in my TBR.