Plenty of the usual crackling dialogue, and lots of verbal ellipticality. Some of it within the story, as Marlowe has to navigate what he can and can't say to the police. Some of it within the narrative as Chandler lets you draw your own conclusions from what's going on.
As is common, once the action seems to be over, Marlowe reveals a couple secrets during the epilogue. In this instance, there's maybe too much of that ingredient added to the recipe.