Tinker, Tailor, Soldier, Spy

Saw Tinker, Tailor, Soldier, Spy tonight (at our local theater, which plays movies about six months after they're current.  I read the book not too long ago and enjoyed it well enough.  I still found the movie confusing.  I would imagine that for those who hadn't read the book, including my wife, the movie was utterly impenetrable.  Too bad, really.  Good story, good cast.  But the film itself was just too opaque.