If you had never seen the movie or heard of the book, you would think Dashiell Hammett's writing was that of a modern contemporary. The story could be taking place in today's San Francisco. But, you HAVE seen Houston's Masterpiece, so you probably think there are no surprises left. You would be wrong. 'nuff said' on that point.
My only problem, and this is purely MY PROBLEM, is that while reading the book, I couldn't help but put Bogart and Greenstreet in their title character roles. It made me wonder how I would have envisioned the characters and setting the day the novel was released or if I lived in a cave my whole life. It doesn't ruin the book, but imagine reading Gone With The Wind after first seeing the movie. No pun intended, but you get the picture. :)