Fritz Lang's Manhunt with Walter Pidgeon and George Sanders.
I saw this film on tv a long time ago - so memory is very hazy!
The film is black and white (probably 1940s) and i don't know if it is UK or US.
It is set during the war and has something to do with a spy going into a Nazi retreat up on a mountain (a bit like Hitler's retreat).
The ending (if from the same film...) has the protagonist and antagonist having a fight to the death outdoors near the entrance of a cave - but as i say, very hazy memory and this may be from a different black and white WWII spy film.
Any ideas?
Fritz Lang's Manhunt with Walter Pidgeon and George Sanders.
There was a BBC remake, with Peter O'Toole about 1976, that was very good as well.
The O'Toole version was called Rogue Male.
Michael Jayston read the book, Rogue Male by Geoffrey Household (1939), unabridged for radio in fifteen half hour episodes, it was on radio4 extra last year and should come round again in the near future.