I bought the film & the book, Seven Days to a Killing, to see how closely they matched. They did in term of an overall synopsis but I found the book more believable as a part spy, part detective novel rather than the film's attempt to emulate a Bond movie. Essentially, they are both about an operative - played by Michael Caine in the film - whose son is kidnapped & tortured to force the security services to part with a load of money (in the book it is to be converted into diamonds - in the film it's just diamonds). The book is overtly anti-Russian as the baddies are KGB; not so in the film but in both cases they are helped by a traitor. I liked the book as it's pacey but the action's in the UK whereas the film takes in France & is less believable though it's fascinating to see the cross-channel hovercraft being used as part of the high-tech scenery.