Father Thomas Morelli thought he knew the story behind Lucifer's fall from Heaven. However, upon making the acquaintance of renowned book authenticator Lorenza Pellegrini and being invited to stay in the opulent Venice villa belonging to her "master," Thomas discovers he has only heard part of the story. In Boston, psychoanalyst, best-selling author, and outspoken atheist David Wright has been tasked to handle the funeral arrangements for his dear friend Albert Kennedy. What could have driven this controversial exorcist to take his own life? The answer, it seems, is contained in a tome that isn't supposed to exist. Joining forces, Lorenza, David, and Thomas must race against time to prevent an ancient battle from reigniting.