This reads more like a survivalist/prepper manual than it does a novel. I suppose it’s a good place to start if you prefer your nuclear war fiction with a nice cup of coffee and a calculator to work out the detailed mathematics of radiation exposure and decay over time.
There are two stories about two people who apparently know each other, but the stories have no real connection or resolution. I would’ve preferred a more detailed account of one of the families or a better (or no) connection, rather than what seems to be a deus ex machina existing only to support more variety in the survivalist/prepper information.
None of the characters are particularly interesting or well developed, and it’s burdened with a lots of anti-government/conspiracy theory baggage. It’s also a little too Jesus-y for me, particularly as I don’t believe that has much of a place when it comes to man-made apocalyptic events.
In the end, the simple net is that it just isn’t all that compelling, nor is it particularly well written. If you’re looking for classic post-nuclear apocalypse fiction, this ain’t it.