I read too many mysteries. Many are poorly written, but even if not I usually know what the ending will be. Not so in this book, even though some aspects of the story were predictable. 
This is not really a mystery/crime novel. It is a story about class and family, as well as the deep sadness.  It is very well-written; I found nothing about it slow and tedious, and I seek out books with multiple points of view. 
Having been a college senior in 1975 and a soon-to-be professional woman in a field dominated by men, I thought that the setting of this book in 1975 was important. The actions of some of the characters were more easily accomplished in the late 70s, and Judy’s thoughts about her future as a working woman were both prescient and, in light of recent events, heartbreaking.