Beneath the Rising by Premee Mohamed

Hope has a price. Nick Prasad has always enjoyed a quiet life in the shadow of his best friend, child prodigy and technological genius Joanna ‘Johnny’ Chambers. But all that is about to end. When Johnny invents a clean reactor that could eliminate fossil fuels and change the world, she awakens primal, evil Ancient Ones set on subjugating humanity. From the oldest library in the world to the ruins of Nineveh, hunted at every turn, they will need to trust each other completely to survive….”