This book wasn't as compelling as the previous two, and I was a little disappointed at the lack of character development for both Katy and Daemon. I liked getting to know Dawson though, and the ending almost killed me.While Obsidian was quirky and fun and Onyx was hilarious with a dark edge, Opal is quite angst-ridden and disjointed. There are steamy romantic scenes places haphazardly between nail-biting action and moments of extreme anxiety. Kat spends most of her time worrying about everyone and everything, but spontaneously forgets everything the moment Daemon touches her. The quick changes in mood took away from the pleasure of reading.Simmer down, Kitten, before I have to get you a ball of yearn to play with.****It sucked-sucked worse than people who pirated books, sucked more than a year for the next book in a beloved series, and sucked more than a brutal cliffhanger ending.I expected Daemon to stop being such a colossal tool once he was in a relationship with Katy, but he stayed the same incorrigible idiot and, instead of being amusing, mostly annoyed me throughout the novel. What made is worse, in my opinion, is that Kat is aware that Daemon is less than perfect but repeatedly asserts that his great looks, sexy voice and super-duper alien powers make up for it.I liked Dawson, and found his slow opening up to those around him really sweet. I expected a few more violent outbursts from him though, considering all that he has been through: in the end he was a lot more stable than I expected. I look forward to hopefully getting to know Beth in the next book, since I haven't read Shadows yet. I was disappointed (yet again) and how little interaction Katy has with others, especially since in this book Dee and Katy aren't exactly bosom buddies. Her human friends fade into the background and the other aliens are painted with quite a broad brush, which makes the story lopsided when it comes to normalcy. It doesn't help that most of the 'normalcy' in Katy's life comes in the form of smexy times with her boyfriend. The continued absence of her mother also slits the story.I really liked the book-blogger references in the previous books, but in this book I think they went a little too far. The stand out thing was when Katy expressed how unhappy she was with a situation by likening it to book piracy, year-long waits between books in a series and cliffhanger endings - it was just too much. I did like her excitement at getting books in the mail since it mirrored my own reactions, but the whole book blogger thing is starting to get repetitive and ridiculous.Overall, I think it's clear that Opal is the weakest book in the series so far, but it's still been good to read. The ending ensures readers will be back for more (a cheap trick if you ask me, but whatever), and I will be reading the rest of the series. The Lux series is a great, light science fiction for fans of young adult books looking for something filled with equal measures of romance and action.You can read more of my reviews at Speculating on SpecFic.