This is in my modest opinion the second best book by Tom Clancy, bested only by the "Hunt for Red October".
This incredibly courageous technothriller is centered around two topics: a Soviet officer who is spying for Americans since the 60s and a new, powerful weapon, developped by USSR - a laser gun able to destroy satelites. This second topic is partly inspired by the true events - such an installation, destined to blind (not destroy) US satelites, was really build in the last years in USSR close to Duchanbe in todays Tadjikistan, but never tried on an American target.
As one of the previous reviewers pointed, this is a very pro-US book, and that is precisely the reason I call it courageous: most spy books usually try not to design one of the blocks (East or West) as being on the good side and another on the bad side. Which is not true in my modest opinion, because let's face it - during the Cold War there was one alliance made of democracies and it faced a totalitarian empire and its unwilling satelites. That alone shows which side was right and which one was wrong. And this book, as its predecessor, takes exactly this position.
The plot itself is also very daring - I do not want to give any spoilers, but towards the end my jaw dropped. Three times in a row. I was like "Oh my God, he dared to write THIS?" And I think that even now, 16 years after the end of Cold War, this books still packs an impressive power to surprise and shock you. And it is also a really good read. I recommend it warmly, as the second best technothriller ever, a perfect second part of the amazing "Hunt for Red October".