Crews and Reese investigate the murders of three Russian mobsters, which brings them back in contact with Roman Nevikov (the awesome Garrett Dillahunt).
Anytime I hear the words "dark" or "darkness," my ears prick up. In this case, Ted is being interviewed about Charlie and Rachel. It doesn't necessarily illuminate the noir in Charlie's character, but it does deepen the understanding of his loyalty to Rachel (or hers to him for that matter) and gives Charlie a possible means of climbing out of the darkness.
Another thing that caught my ear was a brief exchange that is similar to something I've heard before, but it does show the demonstrate the kind of person that might be more susceptible to falling into the abyss of noir. In this scene, Reese has fallen off the wagon and is getting her marching orders from her Captain/boyfriend Kevin Tidwell (the also awesome Donal Logue).