I like Chloe Sevigny in general, though I've been having a bit of a problem with her on this season as she just doesn't seem to FIT... until my boyfriend pointed out that her character and her storyline seem very noir. Perhaps we're giving too much credit, but I think he may be onto something. Her hairstyles (especially that elaborate twisty updo) have been pretty 30's-40's, and her husband is a detective so they feel like time displaced film noir characters.
Her monologue voice over is what really cemented it for me.