Katja's skinshifting abilities are making her more savage and unpredictable with each full moon. How can Katja defend her packmates from their enemies when she can't even protect them from herself? What hope does she have for a cure when a vampire carries the key to recovering her sanity?
Sword of Shannara trilogy by Terry Brooks
Legends of Muirwood series by Jeff Wheeler
Dracula by Bram Stoker