Ambler's best known works are probably The Mask of Dimitrios (1939) (published in the US under the title A Coffin for Dimitrios), which was made into a film in 1944, and The Light of Day (1962), filmed in 1964 as Topkapi.
In contrast to most other spy novels, Ambler's protagonist is rarely a professional spy, policeman or counter-intelligence operative but an amateur who finds himself unwillingly in the company of hardened criminals or spies [REF].