cover an area of espionage seldom see in spy movie represent cryptography and cryptoanalysis . the whole production be give a faint brush of the surreal and it work and especially with dirk bogarde performance a the title character drive by obsession ( and often overwhelm by them ) . that the film also manage to work on an occasional comedic level be an additional tribute to all concern . keep your eye open for a pre mash appearance by donald sutherland .