It could have been so good. It should have been very good. It was neither.
Prior to purchase, I had wondered if perhaps the reviews of this book have suffered from the attitudes of its readers - they are most likely to be a fan of one author (for myself it is Pratchett) and it may be that they felt not enough of their favourite author came through. Upon reading it, I still think there may be an element of that, (I often felt that the Pratchett humour seemed 'stuck-on', like some sort of cut & paste) but this does not excuse the terrible dialogue throughout, or the total lack of any character depth. It does not excuse the appallingly slow plot, which I found shallow and dull.
This book feels like a cheap, hashed-up fan-fiction paperback, a silly tribute to two great authors. It is absolutely shocking to know their individual work, and to see what it has come to. What HAPPENED? I managed to read the whole book, despite putting it down and walking away countless times. A colleague had warned me that it read like a bad TV script, and I have to agree.
It really does come across as something that should be visual, not written. And the ending? Supposed to be a cliff-hanger - I couldn't care less. I really had no interest whatsoever in what happened next, as the characters were so simplistic, and the story was so boring, (despite an unusual premise, which really did seem to have a lot of promise when I read the abstract) that the idea of wading through any more left me feeling depressed.