Yes it is a zombie novel. Yes I know that zombies seem to be everywhere on the big screen, on the small screen, in comics, and in novels. They are I guess the new "it girl" of monsters, with the star of vampires fading somewhat (are vampires really even scary anymore, 30 Days of Night and the vampire Nathaniel Cade in Christopher Farnsworth's novels aside?). One can aruge that can be quite interesting if not scary, but well, that is not the topic to be discussed here.
I need to admit up front I am a sucker for both a good post apocalypse novel and the TV series Walking Dead. And like in the latter series, you get a bit of both, though, quite different from The Walking Dead on AMC, the world didn't quite end. And in that, I think, lies one of the book's strengths and weaknesses. Face it, in a good zombie story, zombies are obstacles, terryifing often to be sure, but not necessarily of the greatest interest themselves. It's the humans, all about the humans. The living ones at any rate. They are both the greatest asset and often the worse enemy.
In the world of The Return Man, not all of humanity died out. In fact, much of it survived. I would even say the vast majority of it. The zombies took over - or was ceded to them - the Evacuated States, the U.S. west of the Mississippi River. To the east, you still have TV shows, shopping malls, fast food, and government (put that way it doesn't sound so great). To the west, wasteland and hordes of zombies. Realistic? Maybe not but I think - heresy that this might be - it is more realistic than The Walking Dead, where no government pretty much anywhere (The Governor aside) survived. Why are zombie universe apparently universes that never had zombie movies? Or an effective military? For a better take (and more developed world, though it is a trilogy in all fairness) on how a post-zombie (but not post-end-of-the-world) society might function and be like to live in, I recommend Mira Grant's Newsflesh trilogy.
Anyway, it is a strength that we have government intrigue, politics at home and abroad, and people "back east" for the main character Henry Marco to interact with (even if often through teleconferences; apparently the zombie rising did not end that). A downside though, even with all those humans still alive, Marco is either alone or has for the most of the book, at most, one other, I would say for now fellow traveler, to interact with. There are humans - bad humans - in the Evacuated States who like Henry Marco make a living (no pun intended) there but mostly they were, eh, obstacles too, not at all developed. Mostly, though there is one huge exception that was quite interesting. No spoilers here though.
This is not a profound book with a Message, just a good zombie adventure story that doesen't pretend to be anything but. It was surprisingly gory at times, describing in loving detail what zombies do to people. Perhaps a bit overly graphic but eh, it's horror. I liked how the author handled zombies in general and while the zombie transmission model wasn't anything really new, it was better explained than in The Walking Dead (though to be fair to that, The Walking Dead deliberately does not deal with the science much if at all).
It is a stand alone book though clearly there could be a sequel, which could either go the "lone zombie killer hero" route, or could deal with the fallout of the intrigue from back east or I guess both. I would likely read it I think, as this one was a pretty fast read.