When a disused church is bought by a young pagan couple who intend to use it for their own rituals, the evangelical local rector reacts with fury. In an isolated community on the Welsh border, an atmosphere of stifling menace develops - with the persecution of innocent people, false accusations and the formation of a Christian vigilante group. Diocesan deliverance consultant Merrily Watkins is expected to keep the peace as this cauldron of conflict threatens to boil over into serious violence. Merrily uses all the diplomacy she can muster, but as the confrontation moves towards its climax, she is unaware of a personal threat against her from a deranged and violent man.