Hidden (House of Night Series #10) by P. C. Cast

In Hidden by P.c. Cast and Kristin Cast, Zoey at last has what she wanted: the truth is out. Neferet's evil has been exposed, and the High Council is no longer on her side-so why is she far from done wreaking havoc in the vampyre world? First a mysterious fire ravages the stables, then, Neferet makes a devastating move that will test them all. With the seeds of distrust sown, everyone must band together-but that's proving to be more difficult than ever before. The twins are barely speaking and the House of Night's former enemy, Kalona, has now become their warrior, pushing their trust to the limit. To top it off, Zoey is pretty darn sure she might be losing her mind-she saw something when she looked at Aurox through the Seer Stone that she can hardly explain to herself, let alone her friends. Is it possible that Heath has come back in a different form? Is that why Zoey's so intrigued by Aurox, when it's so obvious he's dangerous? And who would believe her if she told them? Zoey knows that following her instinct about Aurox might be just what they need to defeat evil . . . but if she's wrong, it could cause the destruction of those closest to her. With the tension at a breaking point and friendships on the line, can the nerd herd come together to stop Neferet before it's too late?