Frankie Paige is in her twenties. She works as a hairdresser. She has a boyfriend. There are a hundred other girls like Frankie Paige within a mile radius of her Boston apartment. But unlike all of them, things happen to Frankie--terrible things she can't understand or explain. And though she has tried everything to make them stop, they're just getting worse. She goes to doctors and psychologists, but even they can't answer the most important question: why her? At the moment of one her episodes, a chance encounter with a local priest is caught on tape and frightening implications of the incident drive the Vatican to send their own local investigator, Andrew Kiernan. Confronted with the powerful force that has taken over Frankie, Kiernan immediately recognizes the true danger she is in, and he must search in his own soul for the strength to save her life--even if it goes against everything he believes.