Few mystery series get to the 20th title, but Donna Leon’s “Commissario Brunetti “ novels have reached that point with Drawing Conclusions. And Amen to that! Scores of readers of this series consider each new volume as comfort candy and devour them happily. The plus is that Leon has created a rich world of contemporary Venice with a protagonist who is not only a thinking, but more to the point, a feeling investigator. Guido Brunetti loves his city, his wife and his work. This time an elderly retiree is found dead by her neighbor and there seems some doubt as to whether it was a mere heart attack or something else. The son is jumpy, the nun at the old age home where Senora Altavilla volunteered is closed mouth, and the husband of one of the patients there is immediately belligerent. With the help of his partner, Inspector Vianello, and the indispensible Signorina Elettra Zorzi and her computer skills, Brunetti sets out on the diverging paths of this investigation. Abuse against women, treatment of the elderly and rapacious art dealers all have a part to play, but as always Venice permeates the novel. And with a perfect ending, what more could you want?