Sounds like you've seen the Bond movies. Ian Fleming wrote the books. The relationship between those often amounts to "the movie used the book's title, and the name of the book's protagonist".
In Fleming's "Goldfinger", Goldfinger is actually trying to steal the gold from Fort Knox. It was much more realistic to have him instead trying to destroy the gold to increase scarcity.
Say what you want about the film "Live and Let Die" but reading Fleming trying to write "jive" was just embarrassing.
But it wasn't the plots that I thought were worse, but the writing itself.
Seems the film-makers largely agreed that it wasn't worth trying to preserve much from the books.
"Diamonds Are Forever" much better than the movie.