Dame Agatha Christie (née Miller) published more than 80 books and plays; and the Guinness Book of World Records lists her as the best-selling novelist of all time with roughly two billion copies sold. ‘And then there were none’ was originally published in 1939, with an un-politically correct title; and it is still the world’s best-selling mystery (with more than 100 million sold). It is also number six on the list of best-selling books of all-time.
