This was a decent conclusion to the series. After reading School Spirits, the book about Izzy Brannick, and then coming back to this series, I really appreciate the witticisms of Sophie's character that much more. 
 In the last third of the book, there are some action sequences that aren't clearly described, so you have to read the passage a few times and extrapolate events from what is said later to try and get an idea of what exactly went on. A little frustrating. But overall, a good read, just not a favorite.