For me, this was the beginning of the downfall of this previously wonderful series. Don't get me wrong; it's still a very good book, as are the next two, but they aren't as good as the first four. It's very clear to me when Pears started wanting to write "serious" books, as opposed to the generally lighthearted and frothy earlier ones. The mystery is plotted just as well as the first four (and probably better than The Last Judgement), but some of the humor is replaced by moral dilemmas for Jonathan and Flavia. Granted, that was hinted at in the two previous books, but ... still.