An excellent horror, bringing to mind the horrors of Lovecraft and Stephen King, but from the perspective of people who don't know what made the world end. The human interactions are spot on and the various personalities are depicted so well you'll recognise the character types from your own life. We've all known a Don, or a Tom, some time in our life.
My only note in the negative column is the book needed another round of edits to catch small holes in the world building and small details which could have been made more accurate.