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The Snow Queen by Joan D. VingeRead about another book on the list.
This Hugo- and Locus Award-winning novel from 1981 involves intergalactic politics and the Snow Queen. The planet Tiamat has been under the thumb of the Winter colonists for over a century, but a new season is on the horizon. The planet will soon be cut off with the closure of a stargate, and will switch to 150 years of rule by the Summer primitives. But not if the Snow Queen has anything to say about it. She will have to fight her nemesis, Moon, from the Summer tribe, if she wants to keep hold over Tiamat. Which is something that she is willing to do anything to make happen.
--Marshal Zeringue