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Ursula K. Le Guin: The  Dispossessed (Hardcover, 1991, Harper Paperbacks)

Shevek, a brilliant physicist, decides to take action. He will seek answers, question the unquestionable, …

A theoretical physicist working completely alone?

I found this hard work, I'm not sure why. The self-sacrifice rings true but the isolated research doesn't. My least favourite of the Hainish cycle so far.