The Earth/Kalquor War seems far away to Sister Katherine and the nuns of the convent on Europa. That changes in an instant when an enemy spyship arrives and invades the tiny moon colony. Katherine's world is torn apart when she learns she is to become the mate to a clan of three fierce Kalquorian men. How can she save herself or the convent's children from their conquerors when her body, heart, and soul cries out for the blasphemous touch of her captors? How can it be that her peoples' sworn enemy is her only chance for true salvation?Sister Katherine is the companion story to the bestselling Alien Conquest, Clans of Kalquor Book 3.Mild BDSM, including captive sex/forced seduction, anal play/intercourse, bondage, Dom/sub play, and multiple sexual partners (m/f/m/m).