Barely a three stars. It's slow and a bit all over the place with redundant plot points. The spinsters, the young lovers, the scarlet woman and the two middle-age men easily manipulated.
The whole religious hysteria, mania and the pastor being the focal point of the spinsters whole lives didn't reach me at all. It's an historical social thing that I can't put my head around.
But it's well written, Alleyn and his cohort of DS, DI and journalist do their job but it's a weak plot and even the lovely writing of Marsh couldn't really save it for me.