Needs to be done as a TV series. BBC, I'm looking at you.
I just finished listening to the adaptation of the novel on the radio, and it was so well done, although there were some changes made.
I think the pace of the novel would really suit a series rather than a film, as this film seemed too rushed for me - what is great about the book is the way the revelations come like slowly peeling off a bandage. It's horrible, but it's suspenseful.
I know the book gets a lot fo criticism from so-called history buffs, who seem to miss the point about it being a fictional alternate history, but I find is fascinating and I'd love to see it on the BBC.