In the heart of suburban New England, the seemingly ordinary Barrett family faces an unimaginable ordeal when their eldest daughter, Marjorie, begins to exhibit signs of severe mental disturbance. Diagnosed with acute schizophrenia, Marjorie's condition quickly spirals beyond the reach of medical intervention, plunging the family into a terrifying realm of nightmares. Desperate for a solution, the Barretts turn to the controversial suggestion of Father Wanderly: an exorcism, positing Marjorie's affliction as the work of demonic possession. This decision propels the family into the glare of the national spotlight, as their struggle is transformed into a sensational reality TV show, "The Possession," captivating and horrifying viewers across the nation. Years later, the scars of the past remain etched in the memory of Merry, Marjorie's younger sister, who at eight years old witnessed the unraveling of her family. Now an adult, Merry's recounting of the events to a bestselling author reveals a labyrinth of family secrets, blurred realities, and haunting questions about the nature of evil and the power of belief. "A Head Full of Ghosts" masterfully weaves a chilling narrative that blurs the lines between psychological thriller and supernatural horror, challenging the reader to confront the darkness within and question the very fabric of their perceptions.