Five out of Five stars, would recommend! I loved this book, and I'm so grateful it's on the Caudill list, because no way would I have picked it up otherwise. 
 It scared the pants off me at a few different points, and I totally knew who the bad guy was like halfway through, but I still loved every second. Also, this is the first book I've *listened* to in ages, and it really enhanced the experience. The narrator was brilliant, and her Lucy voice was perfect, I'm a little bit sad that I'm too desperate to read the second book to sit through 10 more hours of audio. 
 It reminded me very much of Supernatural, the television show, but set up with children as the hunters. That's because here, in this universe, children are the most sensitive to ghosts. They're charged with keeping the adults safe, taking care of leftover spirits that mean harm. 
 I love books where kids are the saviors, Enders Game being the most obvious example of this. My only issue was that... I really like Lucy and Lockwood and George... and don't they have to grow up eventually? Won't they then be useless adults? I suppose when you're a child, you don't worry so very much about growing up, but as an adult I was very worried about it. 
 My library has this book shelved in the juvenile fiction section, but I probably wouldn't recommend this to anyone below 6th or 7th grade, because holy crap, is there some disturbing imagery in here!