Anyway, consensus of opinion on JP (if I remember back that far accurately) was that it was quite a dull run-around up until page 100 and picked up thereafter. At the risk of sounding shallow, I actually rather enjoyed all the running around and certainly didn't feel that I noticed any sudden shift in quality or tone at the 100 page mark. I'm not sure the running around is entirely pointless either, in particular a fair amount of character work is going on, building up the antagonistic English Captain McAllister and developing his relationship with the Doctor. Certainly it's around page 100 that the more horrific aspects begin to turn up - but this is horror for intelligent eight-year olds so it's not exactly a dramatic shift in tone.
This is a tale of 18th Century Edinburgh, complete with Enlightenment scientists, surgeons, buried streets and body-snatching. There are also zombies which aren't, it has to be said, a particularly Edinburgh thing but this is Doctor Who and obviously, if you're going to have body-snatching, you might as well have zombies too.
Of all the new series Doctor Who books I've read, this is the one I've enjoyed most. I'm not quite sure why. Possibly its because I'm so fond of Edinburgh, and the book is very Edinburgh. Possibly it's because it is the first new series adventure I've actively chosen to read, rather than reading it because I read all Doctor Who novels, and it benefits from being approached on its own terms. Possibly it was the lack of any kidults. I don't think it particularly rises above (what I presume was) its brief as a historical action-adventure runaround but it does what it does very well.