I have read the Peter James' Roy Grace books , not all have such nasty outcomes as this one did, I had forgotten, it was one of the earlier ones and they are the sort of books that I don't retain. I do agree with the review in The Sunday Times, this one was pretty horrible, it's a shame the makers, whilst trying to stick to the chronological order. didn't skip it due to the violence it displayed against women.
John Simm's a good actor he doesn't altogether match my idea of Roy Grace although he does capture his sympathetic nature. I don't think the programme reproduces the repartee and banter between him and his colleague Greg Branson which is very much part of their relationship. The actor playing that part comes across as a bit too serious, although he is going through marriage difficulties at the moment, he does however enjoy a good joke often at Grace's expense. In the book Norman Potting is a bit of a seedy slob, the actor playing him seems the antithesis of that, in that he appears rather slim and dapper not how Potting is described in the book at all.