1890-1976. English detective novelist who created the characters Hercule Poirot and Miss Jane Marple. She wrote more than 70 novels including The Murder of Roger Ackroyd 1926 and Ten Little Indians 1939, and the play The Mousetrap 1952. Born in Torquay as Agatha Miller, she married Colonel Archibald Christie 1914 and served during World War I as a nurse. Her first crime novel, The Mysterious Affair at Styles 1920, introduced Hercule Poirot. She often broke `purist' rules, as in The Murder of Roger Ackroyd in which the narrator is the murderer. She caused a nationwide sensation 1926 by disappearing for ten days when her husband fell in love with another woman. After a divorce 1928, she married the archaeologist Max Mallowan (1904-78) 1930.