(1890-1976) one of the most successful English authors of detective stories. Her 67 books and 16 plays have been translated into many different languages. They include The Mysterious Affair at Styles (1920), The Murder of Roger Ackroyd (1926), Murder on the Orient Express (1934), Death on the Nile (1937) and A Murder is Announced (1950). She created the detectives Hercule Poirot and Miss Marple. Agatha Christie also wrote under the name of Mary Westmacott. She was made a dame in 1971.