When their child is stillborn in Rome – on the 6th day, of the 6th month, at the 6th hour – Robert Thorne, an American diplomat (Academy Award®-Winner** Gregory Peck), and his wife Katherine (Lee Remick) are devastated. In his despair, Thorne exchanges his dead baby for one born at the same time…and unwittingly enters a bargain with the devil that culminates in a series of gruesome “accidents”... and a child destined to one day destroy the world!