I've always loved good Noir, so imagine my surprise when watching what I thought was typical procedural fare:
Until I saw this word written in the diary of the primary victim.
I think True Detective may have used this just as a throw-away--but if they really keep the tradition of Hastur--i.e. a dismal atmosphere, then even Banshee will pale in comparison.
On an unrelated subject, I also watched PBS's program on Salinger