Without Warning (The Disappearance, #1)
Format: kindle
ASIN: 8139584
It's not technically post apocalyptic but close enough. The book takes place in the run up to the second Iraq War. It's just before the invasion when a wave of energy of indterminiate origin cuts off all of Mexico, parts of Cuba, Most of the US except for Western Washington, Alaska and Hawaii and ...
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 by John Birmingham, now listed on BookLikes)