When autumn storms blast Hereford, centuries-old human bones are found amongst the roots of a tree blown down on the city’s Castle Green. But why have they been stolen? At the nearby Cathedral, another storm is building around a new, modernising bishop who believes that if the Church is to survive it must phase out irrelevant archaic practices. Not good news for Merrily Watkins, consultant on the paranormal or, as it used to be known, diocesan exorcist. Especially as she’s now presented with the job at its most medieval.