Some episodes sort of clump together with it's plot but mostly still episodic following the crimes. Lucifer's part in it is the story arcWatched up to season two but kinda dropped. I just couldn't deal with the episodic nature, really wish they actually went with more of the story from the Graphic Novel. (Maybe they did in later seasons?). It's a real shame because Tom Ellis really nails the character, seems like it could have been so much more.
Maybe I will re-visit at some point...