Where One False Note focused more on the relationship with Dan, Amy, and Nellie, this one centered on the larger family. It was refreshing to see the other Cahill family branches make an larger appearance in one of the books. Uncle Alistair's relationship with Dan and Amy is one of the major themes. There is also an interesting spin done on the Cahill-Kabra dynamic.
Although I had been wanting to see more of the family, this is my least favorite book in the series so far. There was far too much time spent developing relationships as opposed to tracking down the hints to the clues. I am still looking forward to having time to read Beyond the Grave.