The Fall of Atlantis by Marion Zimmer Bradley

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If you've ever wondered why Atlantis sank faster than your third-grade paper boat project, then Marion Zimmer Bradley has a few creative theories for you in "The Fall of Atlantis." It's a story that would likely amuse the curious minds at SFcrowsnest, who have always found ancient myths and futuristic speculations to be two sides of the same curiously bent coin.
In Bradley's Atlantis, sibling rivalry takes on an epic dimension. Two sisters, Domaris and Deoris, get entangled in magical and political machinations that make your family's Thanksgiving squabbles look like child's play. Domaris, the disciplined priestess, and Deoris, her more impulsive sister, are both swept into a turbulent period that sees Atlantis on the brink of collapse. Magical powers are unleashed, ethical quandaries are faced, and decisions are made that contribute to the eventual sinking of their advanced island nation.