Gracie knows hangovers. She's intimately acquainted with them. But this one? Why did she wake up, half-dressed, on a Florida beach, 1100 miles from home? And this time her father - who also knows about the tragedy of addiction from his struggles with Gracie's mom - isn't going to clean things up.

On the eve of her 19th birthday, Nina finds out that she has been cursed since ancient Roman times by Emperor Justinian. She carries a plague that can wipe out the human race. The Book of Fire reveals that Nina can choose to live and infect millions, or avoid the fate by spending eternity in purgatory. She has three days to decide, and so Nina has no choice but to make her own destiny.