Not only was the book filled with way too much detail about coal mining and its history, but there were way too many characters to keep straight, way too many subplots going on, and having the culprit turn out to be someone who wasn't even involved in the story, and didn't show up until the end of the book, just to tie it to the previous book, was a complete letdown.I see the next book is also tied to this person. I hope it's not totally out of left field too or I'll be done with this series, which is definitely not on par with Stephanie Plum.