Abi, a recently-ordained priest of the Church of England, is appointed to the parish of the charismatic but fundamentalist Kier. He objects to her mysticism, her practice of healing in particular. When she sees a vision, 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 ...