The Originals: The Resurrection (Book 3) - Julie Plec

As the oldest vampires in the world, Klaus, Elijah and Rebekah Mikaelson are less than thrilled that they must share New Orleans with the werewolves. Klaus decides to build an army to take them out once and for all. He's turning vampires left and right, with Rebekah by his side. The new vampires are killing any werewolf they can get their hands on, but as Klaus's army becomes more powerful, he becomes increasingly blind to the dangers that threaten Elijah and Rebekah. An epic choice faces the Mikaelsons, as one of them could be taken from the earth forever.