Radiant Shadows by Tricia Barr

Buckle up, because this is where everything goes to hell.

Caesar and Julian are both struggling with their feelings for Shea, debating whether they can share her. When one of their covers gets blown, can the other two band together and come to the rescue?
In studying the grimoire for a spell to help break Tobias’s curse, Shea discovers something about herself that changes everything. But is it too late to make a difference?
Arya discovers yet another secret in her DNA that causes her emotions to run haywire, so when truths are slipped to her about certain trusted friends, she has no choice but to explode, and hearts will be broken.

The stakes have never been greater for our heroes, and not one but two of them will find themselves in Hadrian’s clutches. Who will it be? And will they be saved or face their ultimate destruction?