If Jason Matthews' book did not exist, this film would be okay, I guess, standing on its own merits. However, having read the book when it first came out, I would suggest that you go read it before seeing this production. You will find little resemblance to the film. I would say the first 1/3 of the film and book are similar. Thereafter, the book takes off in a completely different and more compelling direction, involving a mole in the US government among other things. And while you're at it, pick up and read the next two books in the trilogy. You won't be disappointed!