The Stand.

Stephen King's post-apocalyptic masterpiece, "The Stand," weaves an epic tale of good versus evil after a deadly virus wipes out most of the human population. This gripping narrative pits the benevolent forces rallying around the 108-year-old Mother Abagail against the malevolent followers of the dark man, Randall Flagg. Set against a backdrop that traverses a desolated America, the story briefly but poignantly touches upon Pennsylvania, marking not just geographical bearings but emphasizing the widespread desolation and the fight for survival that resonates across the nation. King masterfully uses Pennsylvania, among other locations, to underscore the vast, eerie emptiness that amplifies the novel's post-apocalyptic atmosphere, making "The Stand" not just a story of survival but a profound exploration of humanity's resilience and moral quandaries in the face of existential threats.