The Demon Hunter: Oliver Nocturne, Book 4

It's scary to know the fate of the world lies in your hands—but even scarier to learn that it might be in your brother's
It's the last night of summer and Oliver is hoping to have some fun with his two best friends. Once school starts, he'll be one step closer to receiving his demon . . . and fulfilling the prophecy to open the Nexia Gate.
 
Meanwhile, a series of gruesome animal attacks on humans has threatened to expose the vampire world. The evidence points to Oliver's brother, Bane, who has recently acquired Occupying power—the ability to inhabit animals. Yet Oliver, Emalie, and Dean suspect something else is going on—a sinister plot that involves Oliver's destiny, and possibly the mystery surrounding his human parents. Bane may hold the key to Oliver uncovering his past and changing his future—if the Half-Light Consortium doesn't get to him first.