It's really unhappy when you realize a book in the mystery/thriller/whatever series would be better off WITHOUT mystery/thriller/whatever. Parts with David dealing with his relatives were superb. On the other hand, the murder annoyed me and the conclusion was unsatisfying, to say at least. To me, it screamed "oh, bloody hell, there SHOULD be a murder in this book, so let's put one there". Not much time spent thinking about it.
If I'm not mistaken, this is an ongoing problem with L.A. series. Things David and Chris are going through are MORE interesting and much better written than mystery parts that feel forced and if like the author herself didn't really enjoy writing them.