1.5 stars. 
 I was promised fun. I was promised a guilty pleasure read. I was ready to just sit back and put away my critic goggles and enjoy, but alas it wasn't meant to be. Maybe this review is a bit overkill, but I can't help it. 
 Obsidian bored me and made me crack up for all the wrong reasons. Part of me wonders if it's that paranormal books can't do it for me anymore, but another part of me knows that's bullshit. If a story is well-written, has great world building and compelling characters then I'm in. I don't care if it's about rainbow-colored trolls. 
 To begin with, the story took too long to unfold. Half of the book was spent not so subtly hinting at Daemon and Dee's alienness. Why does the author make us read through half the book for Katy to figure out something the readers knew from reading the synopsis? It just didn't make sense to me. Not to mention the subsequent info dump when Katy finally does realize the true nature of her neighbors. 
 Speaking of aliens, they really fell flat for me. If I didn't know any better, I would think the light gang was just a supernatural group of humans exposed to radioactive gunk. They constantly talked down to humans and acted as if they couldn't understand them when they acted so human themselves. They displayed jealousy, similar senses of humor, anger, arrogance, etc. There was nothing foreign about them aside from their strange powers. Their abilities were also so lazily explained. Half of the time Daemon is like "I don't really know the science behind it, but trust me." Alright then. So you can manipulate time and space, exert light energy, shape shift and heal? Sure. Whatever, bro. 
 I didn't understand bipolar Daemon or his overly friendly sister Dee. If you truly are this alien race that is trying to avoid detection AND (view spoiler)[ avoid the same mistakes your brother made (hide spoiler)], then why the hell are you making such sloppy mistakes? Dee literally goes out of her way to follow Katy to the store when they first meet. Daemon goes out of his way to sit behind her in class and poke her with that damn pen. Daemon goes out of his way to take her on walks and is "forced" by his sister to spend time with Katy to get his keys back. Not to mention they're using their powers left and right while convincing Katy she's a loon for seeing anything. Christ. 
 I also found it comical how there's a department within the government specifically tasked with monitoring these aliens, but they have somehow remained unaware of their powers? No one studied these aliens? No one was the least bit curious as to their danger? Hundreds of aliens land on your planet and you're not the slightest bit curious? Instead, they're just like: "Fuck it. Dump 'em in West Virginia." A small town where everyone knows each other and what they're up to. A town where even though we as the government can place them in their own compound, we choose to have them intermingle with humans and entrust them to not blow cover. 
 I feel silly pointing this all out, but it just seemed lazy on the author's part. I can forgive an inconsistency or a plot hole here or there, but this was ridiculous. 
 Honestly, just save yourself the headache.