Over thirty million people have read The Diary of a Young Girl, the journal teenaged Anne Frank kept while living in an attic with her family and four other people in Amsterdam during World War II, until the Nazis arrested them and sent them to a concentration camp. But despite the many works - journalism, books, plays and novels - devoted to Anne's story, none has ever conclusively explained how these eight people managed to live in hiding undetected for over two years - and who or what finally brought the Nazis to their door.