The children of Atropos and Lucifer must navigate the treacherous social and magical landscape of a supernatural high school. Eliot and Fiona Post, twins with divine and infernal parentage, find themselves thrust into the Paxington Institute, a prestigious academy for magic wielders. Their challenge is not only to master their burgeoning powers but also to survive the complex social dynamics and hidden dangers within the school's walls, all while grappling with their unique heritage and the expectations that come with it.

The premise of 'All That Lives Must Die' sets up a compelling blend of supernatural elements and the familiar challenges of high school. The narrative likely explores the protagonists' struggle to control their extraordinary abilities while integrating into a new environment. The inherent conflict between their divine and infernal lineage suggests a rich thematic exploration of identity and belonging. The genre conventions point towards a story that balances magical action with interpersonal drama and potentially romantic subplots.