A Head Full of Ghosts is a horror novel by Paul Tremblay. The plot involves an American family under strain when their fourteen year old daughter, Marjorie Barrett, exhibits signs of mental illness. The story is told from the point of view of Marjorie's eight year old sister, Merry. Themes include elements of Catholic exorcism and Reality television exploitation. The novel was published on June 2, 2015 by William Morrow and won the Horror Writers Association's Bram Stoker Award for Novel in 2015. Focus Features has acquired the rights to develop a movie adaptation.