Opal

Opal, the most recent book in the Lux series is a romantic, humorous, heartbreaking book that will surely have you bawling by the end! Daemon and Katy are finally together, and Daemon just got Dawson back. However, Dawson is no where near the same. And he's determined to get his love, Bethany, back from the DOD, with or without their help. Katy and Daemon are finally together, but for how long? And will the DOD rip them apart?

And Blake is back, and Daemon and Katy have to help, unless they want to get turned into the DOD and never seen again. 
Dee is still heartbroken over Adam, and she refuses to talk to Katy. It feels like Katy's life is falling apart at the seams, and the only thing that's right is Daemon. 
Definitely the best book by far. Whenever I read one of her books, I am amazed at how much better it is than the last.