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.

I had read a lot of books on World War II, but I didn't know that downed airmen had hiked over the frozen peaks of the Pyrenees Mountains in shoes that didn't fit, in clothes that weren't warm enough, with German and Spanish patrols searching for them.

[ The Nightingale ]ended up being a huge undertaking - a daunting amount of research on a subject that many people know intimately, a country I had not yet been to when I first started planning the book, an entire war.

I love what I call "re-imagining," where I throw everything up in the air and let it fall in a different way. It's not the most efficient way to write a book, but it's how I find the story.

With The Nightingale, I had been kicking the idea around for years. I was frightened to write it because on the surface it seems so different for me.

The answers are what they are. Just because you don't like them doesn't mean they aren't true.

I know I'm not normal in this, but [ Severus ] Snape is absolutely my favorite character in the Harry Potter books. He is completely mortal - good, bad, strong, weak, motivated by hatred, motivated by love. A gorgeous, compelling, complex character who definitely earns a spot at my table.