Rather a lot: Carolyn’s mother is livid about her “rescue” and Edward is being groomed for a chiefdom he doesn’t want. The Agency’s “elixir of life” has been perfected, and O.W.E. permits mean that certain humans have been authorised to work in the demon realms.
The destroyer is about to face her greatest fear, and it has nothing to do with killing demons:
She must decide what to do about Ethan and Note who risked everything for her and already accomplished the impossible in “Chasing the Demon”.