The Book of Ren (The Gospels of Cal'eia) (Volume 4)

Cali swore she'd never use her power to kill again, yet that's exactly what she's being asked to do, and she can't refuse. Her life and that of her unborn daughter are on the line. She's playing a deadly game, and has pledged her fealty to Lucifer, the very monster she's been running from all this time. She's betrayed her husband, her heart, and her very soul. She's fallen in love with another man and knows her husband will never forgive her. Why should he, when she can't forgive herself? She's already lost everything... That is, unless she can out fiddle the Fiddler.