It is the best selling book series ever in history. A fantastic story stretching over seven books of a boy, growing up in between the two worlds of ordinary people - the muggles - and the wizards and witches. It's about the old story of fighting of good against evil. And as the books sold over 400 million copies world wide, almost nobody could escape the news and the story behind the books, too. The story of J. K. Rowling, a single mother living on social security and becoming a multi-millionaire simply because of a children's book within a time frame of only 5 years.