I found this to be a slightly entertaining spy novel; I don't think it is anywhere close to justifying the superlative reviews that have been ladled on it, both on this website and by others. After reading Ian Fleming's Bond novels (and perhaps I was spoiled by Fleming) I was extremely hopeful for this book, ostensibly the "finest" spy novel ever written.
One of the more exciting aspects of the book is when the main character is spirited into East Germany, and meets increasingly interesting and intellectual interrogators. The exciting middle makes up, in part, for the slightly silly beginning and melodramatic conclusion.
The main romance was a bit difficult to believe, and the plot was somewhat formulaic, but I suppose it isn't too bad. Anyway, even if I'm the only person in the world who doesn't love it, and my review is entirely offbase, I figure that your slightly diminished expectations will be exceeded even farther by the book, and you will be more delighted because of my lukewarm review. If you do buy this book, I hope you enjoy it more than I did.