Slayers, book 2 : Friends and Traitors
C. J. Hill2013

Tori’s got a problem. She thought she’d have one more summer to train as a dragon Slayer, but time has run out. When Tori hears the horrifying sound of dragon eggs hatching, she knows the Slayers are in trouble. In less than a year, the dragons will be fully grown and completely lethal. The Slayers are well-prepared, but their group is still not complete, and Tori is determined to track down Ryker—the mysterious missing Slayer.

What Tori doesn’t bargain for, however, is the surprising truth about her powers. She isn’t just a Slayer, she’s part Dragon Lord, too. How can Tori fight to save her friends when half of her is programmed to protect dragons? And with a possible traitor in their midst, the Slayers will be divided in more ways than they ever imagined.