"You look at your archetypal crowd-pleasing contemporary film. The female roles are ciphers. There's nothing for them to do. Hollywood has started to think, 'We have all these great actresses. In what way can we legitimately showcase their talents?'
"Historical figures are a brilliant way of not stretching the bounds of credibility. You're not writing a movie about two female supercops saving the world. These are genuinely interesting stories about famous female figures who really existed."