When Aidan Lloyd's bleak funeral is followed by a nocturnal ritual in the fog, it becomes all too clear that Aidan, son of a wealthy farmer, will not be resting in peace. Aidan's hidden history has reignited an old feud, and a rural tradition begins to display its sinister side. It's already a fraught time for Merrily Watkins, her future threatened by a bishop committed to restricting her role as diocesan exorcist for Hereford. Suddenly there are events she can't talk about as she and her daughter Jane find themselves potentially on the wrong side of the law.