Next Afterburn by Scott Nicholson

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Massive solar flares soak our planet in radiation and bring about an apocalyptic event.  Millions die from the blast.  Most of the remaining population (human and animal) become mutants.  There are only a small number of humans left and they are fighting for their survival.

The story is captivating at times and full of interesting twists.  However, the ending leaves the reader with to many questions and puts a damper on the entire book.