For me, tried too hard to be the hard-boiled 40's mystery novel. Failed to connect to the protagonist and some of the lingo was going to drive me batty. (This is also a problem with some 40's films so not an isolated issue of this book.) No one really seemed worth rooting for or caring about their path (esp. given the choices some of these people made), so I would give it a pass.
However, full marks for that gorgeous cover. Perfect!