Christoper Jones does a great job. And with Ralph Richardson and Sir Tony Hopkins in support you have to have a real experience. Maybe some people weren't happy that Jones wasn't James Bond. I don't think he was ever meant to be. This is an entirely different protagonist...much more realistic and human. Even with the "correct papers" you were guilty until proven innocent once you entered the Soviet Bloc. The danger he faces was as great as any 007. And he does so without the weapons that J. Bond was provided with. Like Bond, a seemingly impossible mission. But with none of the "Tier One" hardware that Bond ever had. Just a man...no super powers...not even a pistol. This "unfair" powers of force provides a deeper and more subtle level of suspense and tension. He can't survive can he? Can he complete his mission? So I don't spoil it for you I won't go on. Let me say this is one of the best Cold War spy movies I've seen and Jones deserves a great deal of credit. Enjoy.
He was an inexperienced man clutched out of crises and thrown into an impossible situation. I think he pulls this off quite well. Very few remember;e the danger and suspense of penetrating East Germany. The constant striving to be free against the murderous boot of the Stasi.