Maggie Stiefvater

As Grace hides the vast depth of her love for Sam from her parents and Sam struggles to release his werewolf past and claim a human future, a new wolf named Cole wins Isabel's heart but his own past threatens to destroy the whole pack.

Now that the ley lines around Cabeswater are awake, magic is swirling around Blue and The Raven boys and Ronan Lynch's ability to pull objects from his dreams is almost out of control but worst of all, the mysterious Gray Man is stalking the Lynch family, looking for something called the Greywaren.