This film has special meaning for me as I was living in Berlin during the filming and, subsequent screening in the city. Mind you, in 1966-67 the Wall was there, East German border guards and a definite (cold war) cloud hanging over the city. I loved seeing and feeling the night shots in this film and, as it was shot on location, the sense of reality was heightened for me. Very eerie film score, I believe John Barry did it but, I'm not sure. George Segal was good at digging for information without gadgets. A bit too sardonic at times, I think his character wanted to be elsewhere, clashing with KGB agents instead of ferreting out neo-nazis. I feel this film much more typified real counter espionage in the 60's as opposed to the early Bond flicks (which I love, by the way). Senta Berger was gorgeous! And, the final scene (with her and Segal) is done extremely well (won't spoil it for those who still wish to see it...it fully sums up the film, the tension filled times and cold war-era Germany). Also contains one of the final appearences of George Sanders in a brief role, a classic in his own right!