Premise: Dame Agatha Mary Clarissa Christie , Lady Mallowan , DBE ( née Miller ; 15 September 1890 -- 12 January 1976 ) was an English crime novelist , short story writer and playwright . And Then There Were None is Christie 's best-selling novel , with 100 million sales to date , making it the world 's best-selling mystery ever , and one of the best-selling books of all time . And Then There Were None is a mystery novel by English writer Agatha Christie , widely considered her masterpiece and described by her as the most difficult of her books to write . Witness for the Prosecution is a play adapted by Agatha Christie from her short story .
Hypothesis: Agatha Christie avoided professional writing her entire life.
Label: CONTRADICTION