A superb film. In terms of pacing and atmosphere, I could definitely see the influence it had on something like last year's Tinker Tailor. It is a bit of a time capsule, but if you have an interest in the era, it's about as good as Cold War espionage flicks get. It moves slowly, but the tension rapidly begins to build once things take off. And the b&w cinematography is gorgeous. Ritt's best, in my opinion.