The Unholy, based on James Herbert's best-selling book Shrine, follows a young hearing-impaired girl who is visited by the Virgin Mary and can suddenly hear, speak, and heal the sick. As people from near and far flock to witness her miracles, a disgraced journalist hoping to revive his career visits a small New England town to investigate. As terrifying events begin to happen all around him, he starts questioning if these miracles are the works of the Virgin Mary or something much more sinister.