Agatha Christie was a mystery writer.
Agatha Christie . She was initially an unsuccessful writer , but this all changed for the better when The Mysterious Affair at Styles was published in 1920 featuring Hercule Poirot . 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 . The Mousetrap is a murder mystery play by Agatha Christie . The Mysterious Affair at Styles . When the woman is killed , Poirot uses his detective skills to solve the mystery .