Eric Ambler is an English spy novelist who wrote many popular works in the genre. He is best known for his 1939 novel, 'The Mask of Dimitrios', which was later adapted into a film. Ambler's other works include 'Journey Into Fear' (1940), 'A Coffin for Dimitrios' (1939), and 'The Light of Day' (1963). His novels often feature espionage and political intrigue, and are considered to be some of the best examples of the genre.