Tinker Tailor Soldier Spy?

I’m confused! I’m pretty sure I enjoyed this book. But reading it was like coming in in the middle of not one conversation but forty-five conversations, all carried on by people who have known each other for years. 
I think I will have to start earlier in the John le Carre universe to catch up with all the moving parts. Still, I liked it. I especially liked the sense of time and place in cold, rainy England in the 1970’s.
Amazon.com: Tinker, Tailor, Soldier, Spy: A George Smiley Novel eBook: John le Carre: Books http://amzn.to/yUZOw4
If you’ve seen the movie, let me know how it is. I’m looking forward to seeing what the director and screenwriter did with it.