Howdy Gary
Now, not that you would trust my opinion either

but he has a very good point. Aside from the story being modernized (as the book was written in '52 iirc) and a few shifts in plot and character (Felix Leiter is black, M is a woman etc...) it is about as close an adaptation as
From Russia, With Love or
On Her Majesty's Secret Service was (very underated imho).
But speaking of spies and such, did you ever get to try your hand at the Victory Games RPG James Bond 007 ? Quite good imho, but not as "specific" shall we say, as Top Secret, the original. Sorry if this was already asked btw,thanks Gary!