I just saw this movie on Amazon Prime. Directed by Dominic Cooke. Main actors are Benedict Cumberbatch and Merab Ninedze.
This is a true story made into a movie. Story involved around the Cuban Missile Crisis.
A British intelligence M16 officer and an American Intelligence CIA officer had contact with a Colonel in the GRU (Russian Foreign Military Intelligence Agency). He agrees to share the top-secret documents in exchange for helping him to defect to USA with his family.
The M16 and CIA wanted someone to be a courier who will secretly bring the documents passed on by this GRU Colonel from Moscow to London. Since the Soviets suspect anyone and everyone, these M16 and CIA officers decided to recruit an innocent salesman to be the courier. The salesman initially refuses and then agrees.
He successfully brings back to London many secret documents given by this GRU Colonel during the Cuban Missile Crisis. However, the Soviet Union has a spy inside the CIA. They come to know that top secret information is being passed on to M16 and CIA.
The GRU Colonel was supposed to go to London on a trade mission. He was ordered not to go in the last minute. M16 and CIA suspected that the cover of this innocent salesman had been blown. They asked the salesman to drop out of this mission and go home and resume his regular salesman work.
M16 officer wanted to abandon the GRU Colonel saying it all happens in this business. But the salesman had sympathy for the GRU Colonel and he did not want to abandon him. He was supported by the CIA officer.
Finally, they (CIA officer and the salesman) decided to go to Moscow and kidnap the GRU Colonel and his family to West Berlin.
Did they succeed in this mission? Very interesting real life true story. Worth watching. (Please don't read Wikipedia about this movie. It gives the ending of this story.)