Life "behind bars" is not what Kalista, the Heir of Lucifer, expected.

Instead of being in prison, she awakens in the nightmarish asylum where people go in and never come out. Drugged half out of her mind and missing memories, there is only one thing that keeps her going: it won't last forever. Twenty Earth years and a binding ritual are all that stand between her and freedom. But what will be left of her when she's finally released?

With her powers suppressed, Kalista must rely on her wits, her strength, and her biting sarcasm to combat her soul's enemy, Vretil, the Corrupted Angel of Darkness. Will it be enough to keep her sane after the ritual that killed the others? She must survive if she ever hopes to be with her soulmate, and Born Angel of Dreams, Beryx