Stone Alexander a six-year-old boy whose mother has died giving birth to his younger brother, David. During a party at his influential father's home, Stone is left alone with David, who is in his crib. As Stone stares into the fireplace, a fiery force engulfs the boy, possessing him. Stone attempts to burn his baby brother, but David is saved by their nanny. Their father, Daniel (David Hedison), sends Stone away to a military academy in Italy for his education, under the guidance of General Francini (Franco Nero).