3.5 to 4 stars.
The main characters we follow, Jonathan and Fran are an interesting duo. Fighting boundary imps and the likes, they've boarded a train bound for hell and their lives are on the line. Very short but McGuire spins a rather interesting tale, and forges a bond between both of these unlikely characters. I may not have read the first one The Flower of Arizona but from what I guess from here, it must have been some incident!