There's another review up on Amazon for Night of the Necromancer, for anyone who's interested.
It's very well written and offers an in-depth analysis of the book, so if you're yet to read NOTN and think you still might like to, please take note of the spoilers warnings posted throughout the review.
Anyway, without spoiling anyone's fun, here are the bits that stood out for me:
The adventure is extremely well written... it treats the younger reader as they should be treated - like young, educated adults. Green writes with confidence and with a clear focus on the bigger picture. As for the adventure itself, well, if like me you love Fighting Fantasy to death you still won't have played anything quite like this before...
This adventure is like no other that you have played. It really offers something unique, more so than Green's epic masterpiece 'Howl of the Werewolf'. It is solidly written and has something that a lot of gamebooks lack: a genuinely gripping story...
You're in for an incredible ride where you not only cheat death, but where you benefit from it too! The story is gripping, the way the Fighting Fantasy formula is used is inspiring and the whole experience is unique to the series. If this was the last Fighting Fantasy book ever written, we would be ending on a high.
You can read the whole review for yourself here, and you can pick up your own copy of the book here.