I have, of course, seen the movie umpty times and it is one of my all-time favorites. I am now reading the book, and I am pleasantly surprised.
First, the writing is first rate. Rather spare, with a minimum of description. Much of the dialog is reproduced in the movie, although sometimes in different places - my favorite bit, from Nunheim’s wife (or girlfriend?) that starts out “I don’t like crooks…” is exactly from the book, and the casting of that character is nigh perfect.
I’m not sure why Hammett decided to exercise his considerable talent in the detective mode; I guess he believed in writing what he knew. But whatever the milieu, this ain’t no genre fiction. Not a new opinion, but this is literature of high quality.
What’s different in the movie? Mimi is a much darker and more dangerous character in the book, and Dorothy (Wynant’s daughter played by Maureen O’Sullivan in the movie) is a borderline alcoholic, possibly driven by her ugly relationship with her mother. The brother is presented in the movie as more creepy than in the book, where he is just very intellectual and unemotional. The scene at the beginning of the movie between Wynant and his secretary does not appear in the book.
Casting of the main parts? Myrna Loy is perfect (no surprise there) although she is never described in the book except to say that she is 26 at the time. The only thing I can think of against William Powell in the role of Nick Charles is that he is supposed to be taller; he’s also supposed to be about 40 and of Greek extraction, and I think he passes on both of those points.
Oh, Asta in the book is a girl dog.
I’m only about 2/3 of the way through, so Nick hasn’t discovered Wynant’s body yet and the big dinner scene at the end hasn’t happened yet (assuming it does, that seems kind of a theatrical stunt that might not work in a book).
Nick’s detective style seems rather similar to Superintendent Maigret - no pre-conceived ideas, just asking as many questions as he can think of and following the evidence wherever it leads until something falls into place.
Finally, I am enjoying reading this book a lot, but I kind of wish I could have read it without the knowledge I got from seeing the movie so many times.