In a nutshell: a Russian missile scientist, nicknamed Danté offers an obscure Brit publisher, Barley Blair, data that shows Russian missiles are junk.
The '8' is my old rating-I might revise this to 9 or 10 after a fresh viewing. Here's why:
1. I believe le Carré must have had Connery in mind for the lead character, Barley Blair. Truth is: Connery was born to play this role-no one else comes to mind. Barley is a drinker, publisher, philosopher at large. A bit of an anarchist, but firmly non-political. A jazz clarinetist who likes to gab about dreams of world peace-but he really does NOT want to get involved in the process. Connery is perfect.
2. Filmed partially in Russia, the scenery of Moscow & Leningrad is spectacular! This was an early (1990) production with Russian cooperation.
3. Tremendous supporting cast: Roy Scheider (from'Jaws') as Russel Sheridan, the chief agent for US Intelligence, has to play a character of many qualities, above all, an optimist for truly ending the Cold War. When things don't go as expected, he tells the team, 'Put the stools on the bar-TIL next time'. Honorable mention: John Mahoney as 'Brady', the super spy who has the ear of all the American higher-ups, including the President (in the book, Brady is given godlike status-note what he says about the 'deal' being offered by Danté.). And many others! Nice to see a young Martin Clunes as an orderly-long before his Doc Martin days.
4. Not an action film, no sex scenes but some harsh language-but, basically a dramatic study of the Cold War's conclusion. Carré was correct in pondering that even if the USSR missile system lagged way behind the Allied side, would the USA put thousands out of work by shutting down their production?
5. Fabulous irony. Danté tells Blair that 'the men in grey suits came to get his father, & they will come to get you, too!' Barley, like us, is reluctant to accept the notion that the 'good guys' are just as ruthless, but consider how strongly the Americans suspect Blair of complicity, when all indicators show that he is just not interested in money nor political matters.