The Master House, close to the Welsh border, is medieval and slowly falling into ruins. Now the house and its surrounding land have been sold to the Duchy of Cornwall. But the Duchy's plans to renovate the house and its outbuildings are frustrated when the specialist builder refuses to work there. 'This is a place,' he tells the Prince's land-steward, 'that doesn't want to be restored.'

Directed by the Bishop of Hereford to investigate, deliverance consultant Merrily Watkins discovers ancient connections between the house and the nearby church, built by the Knights Templar whose shadow still envelopes isolated Garway Hill and its scattered communities. Why did all the local inns have astrological names? What deep history lies behind the vicious feud between two local families? And what happened here to intimidate even the great Edwardian ghost-story writer M R James?

When Merrily learns that she - and even her daughter, Jane - are under surveillance by the security services, she's ready to quit. But a sudden death changes everything, and she returns to Garway to uncover fibres of fear and hatred stitched into history and now insidiously twisted in the corridors - and the cloisters - of power.