Two men in the apocalypse, riding horses, fighting the bad things out there - human and otherwise. More human than otherwise. There is a reason why bad things hid in the dark for so long to avoid notice of humanity.
Fun read, better than the first novella of the series. Now the characters have been defined and the worldbuilding has begun, Gail Z Martin and Larry N. Martin can really focus on their homage to Supernatural. Lots of action.