In present-day Cambridge, Abi, a recently ordained priest of the Church of England, is appointed to a notoriously difficult parish. The priest in charge is the charismatic but fundamentalist Kier. He objects to her mysticism, her practice of healing in particular.

When she sees a vision of a congregation in an old church, Kier accuses her of witchcraft, but Abi soon sees more visions; an entire Roman family history, dark with betrayal and a promise of bloody revenge.

With foreboding forces building up to violence, Abi must battle the approaching terror along with her own personal demons, drawing upon the expertise of Druidry and shamanism from a questionable source…