I've always been a fan of really good demon possession stories, probably ever since seeing The Exorcist as a young child. There's something about the confrontation of genuine undeniable evil in these stories that gives me hope that evil can be faced and defeated.
I picked up Paul Tremblay's A Head Full of Ghosts because it's about a young woman and her family, who are portrayed in a reality television show as the family struggles with the young woman's demon possession. The story is told from the present day by the possessed girl's sister Merry, now an adult, as she relates what happened in her house from her perspective when she was a little girl.
The point-of-view of young Merry as she recounts the story reminded me of my own daughter, and that added to the terror of the story. Merry is close to her sister, but she doesn't understand what is happening to her as she begins acting strangely, playing terrible tricks on her, and freaking out her parents. There's a sense of foreboding throughout the novel as you wonder what exactly happened to Merry's family. What happened to Marjorie? Was she really possessed? Was she healed? Did things get better?
This was a great story from beginning to end, and I'm interested in reading anything else Paul Tremblay has written as a result.