ID Key: ACAD - Acadia National Park; GNIS - Geographic Names Information System (USA); GNS - Geographic Names System (Canada); NRHP - National Register of Historic Places.
According to the dust jacket, this is a "novel of manners and ...mystery" centering around a Boston family who summers on the "backside" of Mount Desert Island. (The author bought the Criterion Theater in Bar Harbor in 1969.)