Onyx (Lux #2) by Jennifer Armentrout

Summary: "Kat struggles to stay away from Daemon Black, despite being connected to him through his alien powers, and when the Department of Defense comes to town she fears what will happen if they discover what Daemon can do and that she is linked to him."

Onyx wasn't quite as thrilling as Obsidian, but it was still a fun and solid sequel. Kat is growing as a character, which is nice to watch unfold. She is becoming quite powerful, and it is interesting to see how Daemon responds to Kat's capabilities. 

366 pages