An enjoyable thriller that's an involving and easy read throughout. I had growing problems with the plot, but the book resolved those in its final pages. Creepy, and an especially good read if you're sleep deprived due to McMahon's clear prose. If I had to classify it, I'd have to give it its own category, as a fantasy of anxiety. It's a book that has more in common with classics like Shirley Jackson's The Haunting of Hill House than more contemporary fantasy or horror, as the psychological states of the characters are driving forces of tension in the plot. If you like your fairies old-school and creepy, something hinted at and barely glimpsed in the corner from the corner of your eye, this may be your cup of tea.