Robert Barnard writes wonderful mysteries, and this one includes cloistered monks -- almost as good as a locked room!
An English country house murder mystery, except in this case the house is a monastery. The visitors at a religious retreat are not as innocent as you might assume, for all have sinned and fallen short of the glory of God. Barnard's usual cast of well-drawn, off-beat characters whose quirks will keep you guessing at who done it. And why!