I thought this book was pretty good, not as quirky and unique as the No. 1 Ladies Detective Agency, but still all right. I didn't mind the long philosophical tangents either.
What I like most about this book (and the others in the series) are the vivid descriptions of Scotland and Edinburgh. I love how Isabel seems to love Scotland so much. The other characters are also interesting: Jamie the bassoon player, Cat the deli owner, and Grace the housekeeper who attends spiritualist meetings.
I have more of a complaint with the direction the series took after the first couple of books: what started out as a fairly quirky mystery series seems to be turning into a major sap-fest. But that's a review for another book.