Pat Frank 
Alas, Babylon [EPUB ebook] 

"Alas, Babylon." Those fateful words heralded the end. When a nuclear holocaust ravages the United States, a thousand years of civilization are stripped away overnight, and tens of millions of people are killed instantly. But for one small town in Florida, miraculously spared, the struggle is just beginning, as men and women of all backgrounds join together to confront the darkness.