As seventeen-year-old Violet--part-human, part-angel--grapples with her mother's improbable reappearance, any family bonding must wait, however, as Violet, her Grigori partner-soulmate, Lincoln, and their allies discover the plan of dark exiled angel Lilith to dominate both human and angelic realms.
Severity reflects intensity, not value — “central theme” means a warning is a core part of the book, not that the book is bad.