A fun outing with Mercy, Adam, and Jesse. It's nice to see Jesse at the center of a story -- she's such a great character. I'd consider this a nice extra for Mercy fans, but not exactly essential. In terms of the artwork, it's pretty good, although the depiction of Adam does not match at all with how I see Adam in my mind. This Adam is way too muscle-man, when he should be a lot prettier. The artwork also shows Mercy with her shirt tied up above her stomach, like on the book covers, but in the novels themselves, there's never any indication that Mercy would actually dress like this in real life. 
 Oh well, minor quibbles. Hopcross Jilly is a good, creepy story, recommended for Mercy fans.