Heir of Shadows (Daizlei Academy #1)

When 15-year-old Selena Foster is dragged to a boarding school for Supernaturals, she should be thrilled. Instead, she finds herself struggling with insanity and the pull of darkness, because, even among her own kind, she’s a prodigy. She and her sisters know better than anyone the cost that comes with great power, because while Alexandra can play with fire and Lily can heal anything, Selena is more deadly and destructive than the world is ready for.
When she makes a promise to her sisters in order to keep the madness at bay, she finds herself being led down a dangerous path where right and wrong are not always clear. To make matters worse, Lucas Hunter may be the only person alive who can unravel every terrible secret Selena’s keeping—and she can’t stay away.
When loyalties are tested and her sister is placed in mortal danger, Selena must find a way to stop the killing gene before it destroys everything she holds dear.