Quietly in their Sleep By Donna Leon

In Quietly in Their Sleep, the philosophical Venetian detective Commissario Guido Brunetti comes to the aid of a young nursing sister who has left her convent after five of her patients died unexpectedly. In the course of his inquiries Brunetti encounters an unusual cast of characters, but discovers nothing that seems criminal. Is the nun simply creating a smoke screen to justify abandoning her vocation? Or has she stumbled onto something very real and very sinister? Something that places her own life in imminent danger? Quietly in Their Sleep is Donna Leon at the top of her form.