In the unlikely event that the term "film noir" means anything, it must be the meeting of the US detective film and the sinister Germanic look.
The process can be seen well and truly evident in this rarely seen version of the Hammet story. This one has the down beat view of human nature, sinister nocturnal scenes, notably Raft's discovery of Ray Milland's body and the grim shadowed world of thug Williams in his best rôle.
Neglected in favour of the Alan Ladd version which borrows from it - disposing of the stroppy brother with a kick on the shins, the dog attack - this one plays better because it's easier to believe Arnold is running a city and for director Tuttle's use of comedy actors like Irving Bacon, in serious material. Raft as Ned Beaumont, the minder, fits right in here.
Notice the significant difference is the presence of the mother character in the space that the fiancée takes in the later film. The spectacular auto stunt opening gets things moving rapidly too. This one doesn't work up the intensity of the best of the forties thrillers - no erotic smolder and feelings of growing doom but it's still a good viewing that stands with the best crime films of its day.