One Good Turn by Kate Atkinson

This is not my favorite book by this author (who I am very fond of), but if you are a fan, it is a solid follow up to her book, Case Histories.
One Good Turn returns to the now ex-private eye Jackson Brodie two years after the events of Case Histories. Wealthy, retired and bored, he is mooching around the Edinburgh festival while his girlfriend Julia, another of Case Histories' damaged souls, has a part in a dreadful fringe production and ducks his emotional demands. Julia is as absent to us as she is to Jackson, who finds his purpose in the shape of a dead body washed up on Cramond Island and then snatched back by the tide - another lost girl, doubly lost this time. Her death is somehow connected to the road rage incident that begins the book and links the disparate cast of characters while a crowd spectates.
The book is a reasonable murder mystery, would that it fit squarely in that genre, but as literary fiction it is just not her best work.