At first, it seemed like a small story. The royal editor of the News of the World was caught listening to the voicemail messages of staff at Buckingham Palace. In 2007 he and a private investigator were sentenced to prison and the case was closed. But Nick Davies felt sure there was more to it and began his painstaking investigation which ultimately exposed a world of crime and cover-up, of fear and favour ? reaching all the way to the top.