The imperious Winter colonists have ruled the planet Tiamat for 150 years, deriving wealth from the slaughter of the sea mers. But soon the galactic stargate will close, isolating Tiamat, and the 150-year reign of the Summer primitives will begin. Their only chance of surviving the change rests on Arienrhod, the ageless, corrupt Snow Queen, who may attempt to destroy destiny with an act of genocide. Arienrhod is not without competition: Moon, a young Summer-tribe sibyl and the Snow Queen's nemesis, battles to break a conspiracy that spans space. Interstellar politics, a millennia-long secret conspiracy, and a civilization whose hidden machineries may still control the fate of worlds form the background to this novel.
The Snow Queen by Joan D. Vinge. A hard science fiction space opera with roots in fairy tale.