Blood Promise

The 4th book in the SkinWalker series:
Kailin Odel, alpha shapeshifter and demon hunter, made a deal that helped her save her sister's soul: a Blood Promise. Now, the High Priestess of the DeathTalkers is calling in her marker, and Kai had better hope she can hold up her end of the bargain, because either way, it's all about to hit the fan...