Wolf's Blood: Internet Book Database

Raised in the wild by intelligent, language-using wolves, in her teens Firekeeper was abducted back into the lands of men, where her upbringing as a wolf helped her survive the deadly intrigues of human beings.
 
One of the first things she learned in Hawk Haven was that magic was a thing to be feared and despised. Long ago, all the human kingdoms were ruled by powerful sorcerers. Then a plague came and the sorcerers died.  Nobody misses them. Much was lost—but still, nobody misses them.
 
Yet as Firekeeper has travelled and grown wiser in the ways of human beings, she’s learned that the true story was more complex. In coming to the country of the Liglim, she, Derian Carter, and Blind Seer discovered that magic is still working in the world, and that it isn’t always the evil they’d been warned against. But it also turned out that the old plague specifically targeted magic users.  And when Firekeeper and her friends learned to open the gates between worlds, the plague came back with them.
 
Firekeeper, Blind Seer, and Derian Carter survived the plague: not unchanged, but still themselves. Now Firekeeper is determined to learn the nature of the plague--and if she can, to end it forever. What happens next will be the culmination of the remarkable fantasy epic that began with Through Wolf’s Eyes.