In Sacrifices, the prequel to "To Wrestle with Darkness" and part two of the "To Wrestle with Darkness" trilogy, we meet Cil, Deborah, Ruth and Sarah. They are four sisters descended from the coupling of angels and humans. And as such they've been embodied with fantastical abilities which they use to defend the world from those who would harm it, be they flesh or spirit. In Sacrifices, they find themselves tested, as they must contest the forces of darkness who are intent on ending all of creation. If they are to prevail, there will certainly be sacrifices.