There is something plausible abut Michael Caine's performance here. He ("Preston") is the antithesis of Sir Alec Guinness's "George Smiley" - a hard nosed, blunt spy catcher who hates toeing the line with his bosses. After a bit of clandestine activity, he is on his way out and is sidelined until a seemingly straightforward fatal accident gets his alarm bells ringing. Meantime, KGB agent "Petrofsky" (Pierce Brosnan) arrives in the UK and - eventually - takes up residence near an American Air Force base equipped with nuclear missiles. What's he up to and can "Preston" find out and thwart his dastardly plan? This is one of Frederick Forsyth's better stories. The plot is clear to the audience, but the two characters exist in isolation (from each other) for much of the drama as neither know of the other's existence! Despite being experienced and pretty well known, the supporting cast isn't the most effective - I struggled a bit with Ned Beatty's "Borisov"; but both Caine and Brosnan work well to build up a sense of menace as the nature of the mission becomes clear and director John Mackenzie develops a tightly constructed and well paced plot into a denouement that goes down to the wire. It's dated a little, and maybe serendipity plays a wee bit too much of a part at times, but it's still very much at the better end of those cold war stories and is still well worth a watch.