Wolfsbane (Nightshade, #2; Nightshade World, #5)

Calla Tor wakes up in the lair of the Searchers, her sworn enemy, and she's certain her days are numbered. But then the Searchers make her an offer–one that gives her the chance to destroy her former masters and save the pack–and the man–she left behind. Is Ren worth the price of her freedom? And will Shay stand by her side no matter what? Now in control of her own destiny, Calla must decide which battles are worth fighting and how many trials true love can endure and still survive.