The primary thing for me in a mystery is how well the various options for solution are kept open till the end. In this book that was accomplished very well. The secondary consideration is characterization, and I am really growing to like the regulars in Penny's novels. 
 I am amused, however by what seems an inconsistency. In the later books, there is no online connectivity from Three Pines; in the earlier ones there is, albeit Slow. I was about to capitalize 'slow'; however, according to the book that would imply an acronym. As in Ruth's poetry, I'm FINE. 
 A good read.