The Raptor: The First Book of Cataclysm - Cataclysm, #1

The world went mad when Tony lost Jacinda. She was the love of his life, an enigmatic musician he thought he knew everything about-but her dark secrets left him with more questions than answers. Unraveling the past with his therapist opened cracks inside his wounded heart and mind, unleashing a night full of terrors. Were they real? Was his mind finally coming undone? The Thirteen, a collective of mythological gods, are hunting Tony.
Led by a vicious stranger named Malus, the Thirteen are on the cusp of fulfilling a mysterious plan when Tony falls into their malicious crosshairs. To survive, Tony must dig through his own secrets to unlock the truth, which includes a return to the site of his worst nightmares: Grace Falls, Pennsylvania, where Tony met and lost Jacinda. But Tony's not alone-the five voices in his head are there to guide him.