Ash is missing, Samael is eager to wield the power of the Sahar, and Piper doesn't know who to trust or turn to. What she does know is that she's willing to do whatever it takes to both save Ash and keep the world safe from Samael and the Sahar. But when she gets brought to the Underworld, she finds out just how cruel Samael can be and just how far she'll go to save those she cares...