Lizzie Benson, a part-time librarian, is already overwhelmed with the crises of daily life when an old mentor offers her a job answering mail from the listeners of her apocalyptic podcast, Hell and High Water. Soon questions begin pouring in from left-wingers worried about climate change and right-wingers worried about the decline of Western civilization. Entering this polarized world, Lizzie is forced to consider who she is and what she can do to help: as a mother, as a wife, as a sister, and as a citizen of this doomed planet.