Just like THE MALTESE FALCON, I love these film noir mysteries with Bogart.  I have no idea what was actually going on in this film.  It was something about a missing chauffer, blackmail, murders, gamblers, and something or other.  Bogart is just an actor you can watch for hours and hours as he talks tough to the bad guys and suave to the women.  He is quite a magnetic presence.  I only give FALCON a better rating because that film had Sydney Greenstreet and Peter Lorre.  Otherwise...it is a fun Private Eye film.