What I kept was from the novel were the characters of the two girls. The book was a much busier and populated affair. Mona had a proper family, and there was also a creepy pedophile lusting after Mona, two murders. The whole place was in the grip of the Miners Strike, the year was 1984, and the Yorkshire Ripper was on the prowl terrorizing the population. None of this survived into my film–Pawel Pawlikowski.

We should all be questioning our existence a little. We don't have to do it all the time. We've got to get on with work and carry on with our lives, but we should trust our own sense of things and question if what we're being told is the truth–Daniel Craig

Even when dealing with sci-fi story, realism is the key. When in doubt, I try to imagine how it would be in real life. I try to avoid any phony, over-the-top filmmaking effects–Oliver Hirschbiegel

Asking Pinter to rewritea play seemed a ridiculous long shot. But because the piece suited him, it also seemed like an opportunity to write to him. We went for a funny and long lunch at which I told him that the essence of the story was two men in a room, one older, one younger, fighting physically and psychologically over a woman you never meet. Then Harold Pinter just said, 'I've been doing that for 40 years. He agreed there and then.'”–Jude Law