The plot of the book is interesting and I never read paranormal books surrounding demonic possession. I liked how the book was told from the perspective of an unreliable narrator. The book gives the reader a chance to come to their conclusion of whether what occurred was real or not. 

STOP READING IF YOU DON'T WANT ANYTHING SPOILED

That being said...the true horror of this book is Marjorie's parents' refusal to accept their daughter's diagnosis. I truly believe that she was having mental health issues and given how the father poisoned the family and himself was going a little crazy, it made it seem more clear to me what was going on in that house. I believe the father was having mental health issues himself or even was just doing that thing men do when they get sick of having a family. I was expecting the book to be scarier.