Shy American student Alexandra Beckmann - "X" to her friends - arrives in Naples desperate for adventures beyond the sheltered life she has led. She is there to study the Camorra, an infamous Italian crime organization. But in the sun-soaked, ancient city streets, her research leads her to a man like no one else she has ever met. Irresistibly handsome, Lord Marcus Roscarrick is an Italian aristocrat with a mysterious past. Yet, underneath his refined exterior, X senses a man who is well-acquainted with danger. Soon they begin a passionate affair, and X is drawn into Roscarrick's world - a world she never dreamed existed. But as she falls ever more deeply under Roscarrick's spell, X must decide whether she dares to submit entirely to this shadowy realm of dark desire.