"It's been demons to hell and back for almost two years of our lives, and I am freaking sick of it." Anne Waylock thought she was safe. Safe from the madness of demons and the auguren who hunted them. Safe from her tumultuous feelings for the troubled Owin Moran. Safe from the pain of her best friend's betrayal. Four months ago, Anne ran away from it all, and she never planned on looking back. But when Legion, a mutant demon terrifying and dangerous even to other demons, appears in her new refuge, Anne finds herself forced to flee right back to the people she ran away from. As if Legion weren't enough, an "ordinary" demon hunts Anne as well, ready to devour her body and soul. Peter, normally the voice of reason and sanity in the face of the supernatural, has broken with reality. The auguren themselves are confused and frightened of Legion's power and the changes it has wrought. Even under guard from those trained and specially empowered to fight demons, safety is an illusion. To her growing horror, Anne realizes the only way to set earth, heaven, and hell right is another trip to the demon realm of Saltmarch. Facing the dual threats of insidious evil and her own weakness, Anne might just have to risk redemption—the most painful and most dangerous option of all.