Lorna Watson is fun as Sister Boniface and seems to have charisma to spare. The other cast members are fine as well and the production values are good. But something just doesn't work here. I think there are three problems. One, the writing just isn't as good as it could be. Mysteries shouldn't be boring but when you find yourself fast forwarding through a mystery, something is amiss. Second, there is nothing "nun like" in the character of Sister Boniface (aside from wearing a habit). She could be a librarian, a housewife or a pharmacist and it wouldn't change the plot lines one bit. In Father Brown, his Catholicism is regularly invoked so that (most of the time) you know it's a priest solving the mystery. Third, and most oddly, Sister Boniface doesn't seem to be the focus of the series. She plays pathologist, yes, and is ever present but she feels a bit sidelined at times. But it's a nice little time waster if you've nothing better to do.