The Fall of Atlantis (The Fall of Atlantis, #1-2)

A wounded Atlantean prince...a deadly battle between Dark and Light...and the sisters Deoris and Domaris, whose lives are changed utterly by the magic involving them. These are the elements of The Fall of Atlantis, Marion Zimmer Bradley's epic fantasy about that ancient and legendary realm.

On one side stand the Priests of the White Robe, guardians of powerful natural forces which could threaten the world if misused. Ranged against them are the Black Robes, sorcerers who secretly practice their arts in the labyrinthine caves beneath the very Temple of Light. Caught between are Domaris and Deoris, daughters of the arch-priest Talkannon, trapped in a web of deadly sorcery--the same forbidden sorcery that could bring about the fall of Atlantis.