Agatha Christie
The Guinness Book of World Records ranks Christie as the best-selling novelist ever. Her novels have sold about 4 billion copies. Her works are the world's most-widely published books after those of William Shakespeare and the Bible. Her books have been translated into at least 103 languages. Christie's best-selling novel is And Then There Were None. It has sold 100 million copies. It is the world's best-selling mystery novel.