I decided he'd changed so much that a whole new book was required and that book actually I can say so was the first to say that the marriage was in trouble and the Prince didn't like at all and my book was being serialized in the Sunday Times over five weeks.

As a kid I always loved serialized books. It's the reason why people love 'Harry Potter.' Serialization is amazing. It works in television. It works in film and it works in books. Especially when you're a young kid you get attached to these characters.