Alitha Berrenger, a modern young woman of no particular religious faith, innocently embarks on a European tour and unexpectedly finds herself caught in a titanic battle between opposing transcendental forces. She discovers her family's dark history and the evil influence of a demonic spirit trying to possess her and force her to murder a religious leader, sowing further discord in the Christian-Muslim world. Alitha struggles for her life as ancient demons stalk the earth again, legendary curses are revealed, secret societies are exposed and mystic symbols are invoked. Her only defenses are human love, heroic sacrifice and faith. In a fierce, climatic battle for Alitha's soul, the agents of Heaven and Hell gather to renew the ancient struggle between good and evil.