Who is the author of the novel "Ten Little Niggers"?

"And Then There Were None" is a mystery novel by the English writer Agatha Christie, 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 children's counting rhyme and minstrel song, which serves as a major element of the plot. A US edition was released in January 1940 with the title "And Then There Were None", which is taken from the last five words of the song.

The book is the world's best-selling mystery, and with over 100 million copies sold is one of the best-selling books of all time. The novel has been listed as the sixth best-selling title.

In the novel, eight people arrive on a small, isolated island off the Devon coast, each having received an unexpected personal invitation. They are met by the butler and cook-housekeeper, Thomas and Ethel Rogers, who explain that their hosts, Ulick Norman Owen and Una Nancy Owen, have not yet arrived, though they have left instructions.

A framed copy of the old rhyme "Ten Little Niggers" hangs in every guest's room, and on the dining room table sit ten figurines. After supper, a phonograph record is played; the recording accuses each visitor as well as the Rogers of having committed murder, then asks if any of the "prisoners at the bar" wishes to offer a defence.