immediately they are transported back to Hex Hall via a spell cast by the Casnoffs, who are using the school to imprison all of the recent Prodigium students. The Casnoffs plan on raising demons through the students, experimenting on which type of Prodigium will adapt best to the spell. While imprisoned at Hex Hall, the students—particularly Archer—undergo both physical and mental torture orchestrated by the Casnoffs. Meanwhile, Sophie finds herself conflicted between her love for both Cal and Archer, which is complicated by Elodie's intruding. Sophie and the others learn of the Casnoffs ultimate plan, which is to raise an army of demons in a misguided attempt to protect the Prodigium from humans. Sophie and the others manage to escape Hex Hall through the Itineris after Sophie manages to regain her powers through sheer, desperate willpower. Sophie is reunited with her parents and the Brannicks, who explain they cannot defeat the demons that have been raised without the help of demonglass; Sophie, Jenna, Archer, and Cal journey to the Underworld to retrieve it, where they are forced to witness memories related to their tragic pasts. Sophie vows to kill the Casnoffs and break the demon spells, returning the Prodigium to their true forms. A battle breaks out between the Casnoffs and Sophie's group. At first outnumbered, Archer manages to persuade a sect of The Eye to join in on the battle, in an attempt to help defeat a common enemy. Sophie and the others manage to defeat the Casnoffs and break the spell, however, Cal dies after sacrificing himself to save Sophie. In the subsequent aftermath of the battle, Sophie is called into a meeting with The Council, who offer her the position of Council Head, after witnessing her demonstrations of leadership and power in the fight against the Casnoffs. Sophie agrees to consider the offer, but explains that she would prefer to finish school first. In Cal's honor, Sophie requests that Hex Hall be re-opened, this time as a regular school for Prodigium students, and the Council acquiesces. Sophie releases her bond on Elodie, who is happily bound to Hex Hall. She joins a ghostly Cal for a walk on the grounds. Jenna and Archer return with Sophie to Hex Hall, explaining that they would prefer to stay with Sophie than to go off on their own, and Sophie realizes that she has finally found happiness. Spin-off novel In