One Second After - hardcover. An electromagnetic pulse fries all electronics in the US. Without refrigeration and transportation, people begin to starve, and die from formerly-treatable medical conditions. The protagonists instantly become insular, and proudly are notably unhelpful to their fellow citizens as they migrate from urban areas to look for work and food in rural farms. Then, they fight off a cannibal army. This is odd, as all 20th-century examples of widespread cannibalism involve neighbors eating each other in secret; if people have enough energy to march all day, they aren't at the stage where they resort to eating scrawny humans. Then the US marines come back from Iraq/Iran and give everyone MREs. The end.
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