Plot: Directed by William Friedkin, this documentary chronicles the real-life work of Father Gabriele Amorth, the Vatican's chief exorcist. The film provides a rare, direct look at Father Amorth performing his ninth exorcism on an Italian woman referred to as "Cristina." Friedkin, known for directing The Exorcist, delves into the phenomenon of demonic possession, incorporating interviews with neurologists and other medical experts to explore both spiritual and scientific perspectives on the ritual and the cases Father Amorth handled. It offers a unique and unsettling glimpse into the world of Catholic exorcism through the eyes of one of its most prominent practitioners.