After how Onyx ended, Katy and the Luxens are still reeling from how everything went down. Death, destruction and Daemon seem to be following Katy around - and there seems to be nothing she can do to stop any of them. Although the Daemon situation is one that Katy is more than happy with. 
 If only her friendship with Dee was as strong as her relationship with the arrogant and impossibly sexy alien. 
 With her world falling apart around her, Katy is doing all she can to keep a handle on her mutated abilities and her boyfriend's estranged brother being back on the scene. Things only get more complicated when Blake reappears at school and blackmails the Luxens into the most dangerous and insane plan ever - to break into the Department of Defence's (DoD) secret base and break out his Luxen bondmate. 
 With less action and more romance, Opal is a very different book than the previous two - all that considered I thought it was a great instalment in the Lux series. Katy is stepping out from the victim role and becoming a character that I like and want to read about. Her relationship with Daemon has evolved - no longer is she convinced he's just with her because of the bond. Oh no - now they're "official" with all the trimmings that goes along with their newly defined status. Sweet and sexy as Daemon may now be, I sort of missed the over-confident and harsh character I'd grown to love from the first two books. I found their interactions to be lovely and I'm hoping that they can weather all the DoD and Daedalus throw at them. 
 Plot wise - this book missed the mark with me. I wanted more action, more development of the new characters (Luc, Paris, Ethan) and some more explanation to some of the crazy twists. Some of the bizarre points seemed a little far-fetched and one part seemed to exist just for some blatant product placement (Macbook Air, anyone?). 
 Overall, I enjoyed Opal. The characters grow on me more every time I immerse myself into the Lux universe and I'm on the edge of my chair with anticipation awaiting the release of Origin (Lux #4) after the cliff-hanger at the end of Opal.