What made you decide to tell Katherine’s story from the point of view of her lady in waiting, rather than in the first person?

I had some very good advice from my agent: ‘Don’t just re-tell history as we already know it. Look at it through someone else’s eyes.’ Then, when I was reading letters written by Katherine Howard’s interrogators, I came across this cryptic, chilling line: ‘Mistress Tilney hath served us well’. I knew that at least one of the Tilney girls – Catherine – had grown up with Katherine, and accompanied her to court. Katherine Howard was betrayed by someone close to her, but we don’t know who or why. As soon as I read that line, I had my story.