I read more and more and I came across this character, Caroline Weldon. Sometimes in history, you find these people that no one would dare create. They're too mad.

There were three options [in Allied], which were for [Bred Pitt] to shoot [Marion Cotillard], for them to escape, or for her to pull the trigger, which is a heroic act to spare him. When I was thinking about how it would end, a long time ago, I think I tried each of them to see, but two of them did not work.

The story [of Allied ] itself is the story I wrote, and that's what's great about Bob [Zemeckis ]. You have meetings, but it's meetings for clarity, not to change what they're saying or doing. He takes what's on the page and executes it so brilliantly.

In other words, when you have someone [like Ridley Scott] with that authority, then you tend to be left alone. But they were good and they're really good people, and I'm a big champion of the BBC and I think that like minds find each other and I think that FX and BBC is a perfect match.

Just the idea that someone is married and they've got a kid, and he reports for work one morning and his boss says, "You're wife is a spy. Shoot her." In the real story, he just went back and did it, which would have been a short film. Therefore, I had to spend some time exploring what you would do.

I find the best way to make things real is to just put two characters into a space and let them talk to each other in the way that they would talk to each other, and then see what they would say. I know it sounds weird, but that leads the plot and takes you in another direction.

What I wanted to do [in Allied] was get two characters who fall in love for real, across the barricade, and then it transcends the war.