Just finished reading "Rockfall" by William Allen, the first of the "Tertiary Effects" series. I found the author to be a very good storyteller, and am looking forward to reading the next book. I can recommend it to anyone who likes suspence or disaster fiction.
Rockfall deals with the indirect consequences on a Texas family of a meteor strike in the China Sea. Although the direct consequences of the tsunamis, earthquakes, and volcanic eruptions (the meteor was a big one, although not extinction event sized) that the meteor strike caused are mentioned, the author hasn't set his story where any of this is happening, which is refreshing. The author's emphasis was on what happens when supply chains break down, when the meteor (and it's immediate side effects) wipe out a largish amount of the human race.
Also refreshing, are that his main protagonists aren't "hard-core" preppers. Preppers they are, but they prefer to keep a low profile, on the theory that if you've prepped for disaster, it really isn't a good idea to let other people know about it.
The possibility of nuclear war is touched on which also seems reasonable, as nations scramble to grab land from their neighbors during the disaster, although the protagonists don't dwell on it, since it isn't something they can control. They're more concerned about the effects of the meteor on weather during the initial weeks of the calamity, as well as their fears about what it might mean for the upcoming winter, and its effects on next year's farming. We also get a bird's-eye view of the gradual erosion of law and order in a small town; part of it is foreshadowing for his next book, involving not only the expected low-level evil-doers who take advantage of the calamity, but also a corrupt lawman.
I feel the author has done a good job of writing for entertainment, without giving the reader (at least me) the gut-clenching feeling that "everyone is doomed, it's survival of the fittest!" (although, face it, apocalyptic fiction goes rather far in that direction). I don't know about the science of some of what he's describing, particularly about the meteor triggering earthquakes and volcanic eruptions, but it sounds plausible and I'm quite willing to suspend belief for the sake of a good story -- yes, the author is that good. Just don't read it before bedtime.
Go. Read. Enjoy!