This is a solid 3.5 star book. I really enjoyed it. I've read a bunch of other reviews where people remark on the violence and blood and gore. I didn't think that it was that bad. Certainly, there is a lot of implied violence and some actual violence but the disturbing part is the threatened violence (which, thankfully, never gets explained in detail). Some of the aversion to violence brought up by some reviewers seemed a tad hysterical. It's not like the first book in this series was G-rated.
Back of Beyond was my first CJ Box book. I really enjoyed it. I agree with some of the plot holes that others brought up. But, I didn't think that they were so bad that I couldn't continue that book. With The Highway there were a few odd things i noted while reading but nothing too bad. I didn't think my suspension of belief had to be too drastic to enjoy the book. There is a MJAOR plot twist that I didn't see coming. And since I thought this was a series I was thrown off guard and bothered by it. I was hoping to get into a series with several books. Clearly, the author wanted to go in a different direction (I would expand on what I mean but it would be a major spoiler).