I'm going to be a heretic and say that I thought 'One Second After' sucked!
Read like a thematic plundering of Niven's 80s classic, 'Lucifer's Hammer'.
Right down to the cannibalistic black gangs.

I've got an entire bookshelf of Post-Apocalyptic literature, and I'd rank it amongst the worst.
Though I suppose if you are not a fan of the genre, it makes for a convenient review of the half dozen source novels it copies.

This is what happens when I post before coffee.