'Are people still going to go out and buy this?

'Even if you are a bestseller you feel insecure because it is all so unpredictable. You think, are people still going to go out and buy this?

I'm just as insecure for my new book as I was for my first one. Even with all the research I do, I don't really know where the ideas come from, so I feel nervous about the ideas not being there one day. I'm always surprised when large numbers of people buy my books. I think: "Who are all these people?"

Patricia Cornwell in the Sunday Telegraph's Seven.