You will find hardly any improvising on camera anywhere in my films. It's very structured, but it's all worked out from elaborate improvisations over a long period, as you know.
I think that Iran with a nuclear weapon is extremely destabilizing. I think it could precipitate a nuclear arms race in the region.
Generally my typical books have lots of twists and turns a big surprise ending and then usually another surprise at the end and ideally, as in Garden of Beasts, we get to the very end and we find at the last few pages that there's yet another surprise.