A Head Full Of Ghosts by Paul Tremblay

The book is a chilling psychological thriller that blurs the lines between reality and supernatural horror. It revolves around the Barrett family, whose lives are turned upside down when their eldest daughter exhibits signs of acute mental illness—or perhaps demonic possession. As their situation grows increasingly dire, the family agrees to participate in a reality television show, with cameras documenting the exorcism of their daughter. The story is recounted years later by the younger sister, who reflects on the traumatic events and the impact of public scrutiny, leading readers to question the true nature of the horror that befell the Barretts. The 7572nd greatest book of all time