The Queen of Crime Agatha Christie is the best-selling author of all time. She has sold over two billion books worldwide and has been translated into over 45 languages. In a writing career that spanned more than half a century, Agatha Christie wrote eighty novels and short story collections. She also wrote over a dozen plays, including The Mousetrap , which is now the longest running play in theatrical history. http://www.agathachristie.com/