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"And Then There Were None" is what author's best-selling novel, with over 100 million copies sold? Danielle Steel Agatha Christie Barbara Cartland James Patterson ******** Answer: Agatha Christie is the most widely published author of all time, outsold only by the Bible and Shakespeare. Her books have sold more than a billion copies in English and another billion in a hundred foreign languages. And Then There Were None is the signature novel of Agatha Christie, and it is her bestselling novel. With more than 100 million copies sold, it is also the world's best-selling mystery novel, and it made Agatha Christie the best-selling novelist of all time. Publications International lists the novel as its sixth-best-selling title.