Barnard hit a home run in this book. (Not that there is anything to do with baseball in it.) The first person narrative is very effective, although I did wonder if the person was always informing the police about her suspicions as she tries to unravel the mystery. The motive is certainly unusual, and you won't find another murder mystery with exactly that.
The new High Church vicar announced he was celibate--that did not sit right with the spinisters in the community who immediately started competing for him. This book does a good job of mixing satire and suspense.