Changeling: Dark Moon by Steve Feasey (author)

Fourteen-year-old werewolf Trey is getting more powerful by the day. But can he control his powers – or will they bite back? Trey is being sent on a dangerous mission to Iceland, where he must infiltrate the evil empire of the vampire Caliban. Soon Trey’s abilities are tested to the max, as he is challenged by a rage he cannot regulate, and a dark angel with looks that can kill. Meanwhile Lucien Charron, Trey’s mentor, lies in a coma in London. Trey is his only hope for survival. But the Netherworld is intent on total destruction, and Trey is about to face his nemesis…