The Maltese Falcon.
Just about anybody who knows anything about movies has heard of it, even if they haven't seen it. A surprising number of moviegoers don't realise it was a book first (although everybody on this forum will know that).
The movie deleted one character (Gutman's daughter) and one major scene. Almost every word of dialogue was direct from the book (rare in movies).
I like both, but I think the movie is a bit better.
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