When psychiatric treatment fails to cure a 14-year-old girl’s bizarre outbursts, her desperate father turns to religion. And with the family’s finances in dire straits, he allows a film crew into their home to film a reality TV show about the apparent demonic possession and ensuing exorcism.

This book is told through the eyes of Merry, the 8-year-old sister of the troubled teenager. Tremblay’s handling of such a young viewpoint character is truly masterful. As the father of an 8-year-old girl, Merry felt authentically kid-like, not like the weirdly precocious miniature adults so often seen in entertainment. She’s stuck in a terrifying situation that she’s even less equipped to handle than her struggling parents, betrayed and frightened of the older sister she used to idolize.

Unfortunately, despite a great viewpoint character, the story isn’t quite as fulfilling as it could have been. The possession and climactic exorcism are handled in a pretty traditional manner that’s been seen in fiction a dozen times. The reality show trappings and passages of the book featuring a horror blogger providing wry retrospective commentary upon the TV episodes add some originality to the proceedings, but in the end it felt more could have been done with those elements.

I enjoyed this book and raced through it pretty quickly, but despite moments of excellence it felt like there was some wasted potential.