Agatha Christie was a mystery writer.
Agatha Christie . Later the same year , Witness for the Prosecution received an Edgar Award by the MWA for Best Play . 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 . The Edgar Allan Poe Awards ( popularly called the Edgars ) , named after Edgar Allan Poe , are presented every year by the Mystery Writers of America , based in New York City . They honor the best in mystery fiction , non-fiction , television , film , and theater published or produced in the previous year .