It was the early 1960s, the USA and Russia were in a race to amass nuclear weapons. It was to the point that if both of them did a maximum launch at each other it would destroy most of the world as we knew it. In truth they wanted to bury each other.

In October 1962 I was a senior in high school and that is the month of an event that came to be called the Cuban missile crisis. Russia decided to move nuclear missiles to Cuba, just a few miles off the coast of the USA. There was nothing favorable about that move. The still new US President JFK had a tough decision, how to confront Russia and get them to reverse their plans. As history witnessed Russia backed off.

That is a central theme in the story here, based on real people and real events. An English businessman was convinced to expand his business dealings to Russia, there he would befriend a Russian who would pass him photographic microfilm. He became the courier. A main topic were the plans to place the missiles in Cuba. This spy work was what tipped England and the USA off to the Russian plans and allowed them to monitor the situation which eventually resulted in the confrontation to get Russian ships to turn back.

This is a very good movie, well-acted and well-told. My wife and watched it streaming on Amazon.

Edit July 2023: Watching it again, it is such a well-made and well-acted movie you can watch it every year or two and still enjoy it as much as the first time.