John is down to the last few Withered and he’s got a lead. One thing leads to another and he ends up in another small midwestern town, working at a mortuary. Sound familiar? It’s a nice blend of old and new and works well as a conclusion for the series.
Eventually, the FBI show up and help to wrap up that storyline through the previous three books. We meet a handful of new Withered (including some surprising new powers) and get a bit more backstory. It doesn’t explain as much as I still want to know, but it’s more at least.