And Then There Were None is a mystery novel by English writer Agatha Christie, her best selling novel and described by her as the most difficult of her books to write. It was first published in the United Kingdom by the Collins Crime Club on 6 November 1939, as Ten Little Niggers, after the British blackface song, which serves as a major plot point.
The US edition was released in January 1940 with the title And Then There Were None. All successive American reprints and adaptations use that title, which is taken from the last five words of the song.
It is Christie's best-selling novel, with more than 100 million copies sold; it is also the world's best-selling mystery and one of the best-selling books of all time. Publications International lists the novel as the sixth best-selling title.