Merrily Watkins, a widowed rural vicar with a teen-aged daughter Jane, is learning the art of exorcism from the experienced clergyman Huw Edwards, despite the warnings that it is dangerous from reclusive, troubled Canon Dobbs. Merrily is called upon by the police to help investigate the crucifixion of Satanist Paul Sayer after which she agrees to absolve the dying Denzil Joy, a man reckoned to have an evil spirit and as he dies Merrily is convinced it has passed to her. Aware that Dobbs knew and feared Joy Merrily visits the canon's house and makes a shocking discovery. Meanwhile Jane is approached by café owner Angela Purefoy who claims to be in touch with her dead father.
