To be honest, I wrote so many drafts of this book [ The Nightingale ] and changed the characters so many times; the real surprise is that I finished the book at all.

I'd extend an invitation to Lisbeth Salander. She would definitely shake the party up and get it started. I think she is hands down one of the most original, innovative, kickass female fictional characters ever.

Andrée De Jongh story led me to other stories of women who joined the Resistance in France. I found literally dozens of memoirs written by women who had become spies and couriers and helped to create the escape network. These women were like action-star heroes.

I am more than happy to invite my five favorite fictional characters. Let's see. First on my list is Sam Gamgee from The Lord of The Rings. Sam is a beautiful character; in him, we find the profound heroism of an ordinary person. He epitomizes the saying that courage isn't not being afraid, courage is going anyway. I just love that.

In doing the research, I found myself consumed by a single, overwhelming question, as relevant today as it was seventy years ago: When would I, as a wife and mother, risk my life - and more importantly, my child's life - to save a stranger? That question is at the very heart of The Nightingale. I hope that everyone who reads the novel will ask themselves the question.

The material world is simply an expression of the mind; that's what so many fail to see. We're so dependent on what is before us that we discount our intuition. Yet if one dismisses instinct, how can one understand or believe in a world that exists beyond one's sight?

I think The Nightingale is my best, most mature, most moving novel, but maybe that's just because I love these characters. I love the setting.