All right, I officially dig on this book series. Don't care what anyone else thinks - this was a good book. It kept me on the edge of my seat (or bed I should say) the entire time. 
 Opal picks up with Katy trying to come to terms with all that's happened. Not only is (view spoiler)[Adam dead (hide spoiler)], but the entire group is coming to terms with the return of Dawson. He's not the same person and neither is she. However, while Dawson's crazy is to be expected, Katy must keep her feelings to herself as she has become both an enemy to the DOD and even her alien friends. 
 However, the one shining light is her new, official relationship with Daemon. Finally able to tell him how she loves him has freed her in a way. Oh and she does love him, not that he's said it back yet. 
 Now that Dawson is back, though, he wants to get Beth back. While he found freedom, his love is still trapped in the heart of the DOD and is desperate to get to her. With the reappearance of an old enemy, Katy and Daemon are determined to figure how to help Dawson while simultaneously keep each other alive. 
 So the big thing in this book that had me swooning was the growing relationship between Katy and Daemon. It feels so rare to see happy, sweet scenes in a paranormal YA. Most of the focus is generally on the paranormal and, furthermore, it's YA. While a love story may be a main aspect, it generally never gets super fluffy and I happen to love me some fluff. 
 So all I can say is: 
 FINALLY! 
 Ugh talk about some UST. I am adding a shelf because of how intense that got. I think the way it was written was surprisingly real for a young couple in love. Armentrout didn't sugarcoat it nor did she make them stupid, making it clear they were using protection (THANK YOU). 
 Take into account, though, that while they forged a deep, loving bond, Katy didn't back down to Daemon. Sure, she could completely empathize with his worries and even acknowledged he was right many times, but that didn't stop her from making her own choices. 
 "Screw going home. This wasn't the 1950s. I wasn't a fragile human being. And I sure as hell wasn't the Katy Daemon had initially met. He was going to have to deal with it." (pg. 48). 
 Daemon doesn't want anything to happen to her, but when he realizes she isn't going to be held back, he embraces making sure she's prepared. He's protective, not controlling. There is a difference. 
 It should be noted that this book ends on a HUGE cliffhanger. Like, if I read this and the next book wasn't out, I'd be fuming mad cliffhanger. Luckily for anyone reading this now that hasn't read it, book 4 is out! So make sure you have it next to you. 
 I'm already reading mine :)