Sophie has been attacked by demons, destroyed a nest of vampires, and lived through the death of someone close to her. Now she and her friends have been rescued by the Society and taken to a secret island base to train. While they desperately search for leads on where Akeldama may be holding Lilli prisoner, Sophie tries to keep Tristan at arms length. She doesn't need anything to distract her from finding her best friend, or so she tells herself. Then the unthinkable happens. One of the Society's own has betrayed the Guardians, selling their secrets to the demons and attacking them where they should feel safest. In the end, Sophie's greatest enemy could be her own fears, and she faces a decision that could push Tristan and her friends away forever.