It is September, 1997. Mother Theresa passes away in India due to a cardiac condition. It is the same week that Princess Diana died in Paris and the world is mourning two great and famous women at the same time.
When Mother Theresa dies, a young boy who is a victim of extremely disfiguring leprosy prays to her and, six months later, his condition is cured without any medical intervention. Father Jacob Myers (Martin Shaw) takes the case to Rome and is surprised that the church will not accept the miracle and tells him to search for another. Meanwhile, the young man in question, Vimal, decides to become a priest and does his training at St. Bartholomew's Seminary where Father Jacob resides and acts as his mentor.
Father Jacob is surprised when a young girl named Donna (Romy Irving) comes to see him and tells him that she believes her father is possessed. At first, Father Jacob is dismissive but after meeting with the man and realising that he intends to violate his daughter whilst under the influence of spirits. He performs an exorcism with the help of the chief exorcist who tells him that evil is coming for him because he will one day be chief exorcist himself and the demons do not want that to happen. They are not alone in this because Father Jacob doesn't want the job either.
On top of all of this, a homeless man named Michael keeps crossing paths with the good father and it soon becomes apparent that he too is possessed when he murders young Vimal in a spa where gay men congregate. Vimal is skinned and left in the sauna and Father Jacob realises that the chief exorcist was right, he and those close to him are being targeted and that Vimal will not be the only victim.
A great piece of British drama with a faultless performance by Martin Shaw in the lead role.