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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.

Merrily is not convinced that Canon Dobbs killed himself and links his death, the murder in the woods and a dead crow on a church altar to a possible Satanic rite. Following a ceremony of exorcism where she 'sees' Denzil Joy she learns that the canon was visited by a bearded stranger and was also obsessed with the life of medieval bishop Thomas Cantilupe. Social worker Lol Robinson, hearing of the dead crow, tells Merrily that his client Rowenna, Jane's loner friend, also found one on her door-step though Rowenna gives it no significance. Merrily argues with Jane over the company she keeps, including a strange youth, James Lydon, known as the Boy Bishop of Hereford and then goes to the church to pray, believing herself to be alone.

Following a row with her mother Jane runs away and Lol unearths a secret about Rowenna which may make her party to the flight. Huw discovers that Thomas Cantilupe, in whom Canon Dobbs was so interested, was baptized in the church where the dead crow was found and was a medieval fighter against demons, charged with the protection of Hereford cathedral, even after his death. With his grave desecrated the cathedral is once again exposed to Satanists. When Lol tells her that Jane is entering the cathedral with two false friends for the boy bishop's crowning Merrily realizes that her daughter is in danger and rushes to save her as well as to rid herself of Joy's baleful influence.