Rachel Vincent 
Oath Bound 

Even the most powerful supernatural family can unravel… Sera Brandt, the secret daughter of the head of an infamous paranormal crime family, has hidden her past, her potential and especially her powers. But when a tragedy strikes, Sera needs justice. And the only way to get it is to reveal her heritage-including a rare and dangerous magical skill-and take the reins of the powerful Tower Syndicate.Kristopher Daniels has fought the Syndicate to protect his sisters, but he’d never realised just how close to the new heir he needed to get. His new bond with Sera could be the key to defeating them once and for all. Or, with a target on their backs, it could be Kristopher and Sera’s ultimate downfall.