A Vow of Sanctity — Veronica Black

A Sister Joan Mystery.
All is not well on beautiful Loch Morag in Scotland, where Sister Joan is resting at a spiritual retreat. Children make signs to ward off the evil eye whenever she passes. She suspects she is being followed. And in the dark crypt, where the bodies of the dead remain partially preserved, she feels the touch of a live hand.
A tragedy from the past still grips Loch Morag. But that is nothing compared to the evil in the present, when a sudden storm reveals murder -- and Sister Joan must abandon her solitude to ferret out a killer. . .