In Rome, an American diplomat and his wife experience the heartbreak of a stillborn child. To spare his wife further grief, the diplomat secretly adopts an orphaned newborn, presenting the boy as their own. Named Damien, the child grows up in a wealthy and loving environment, yet unsettling events begin to surround his presence. A series of bizarre and tragic incidents start to raise concern, casting a shadow over the family's happiness and leading the father to question the true origins of his son.

Driven by a desperate need for answers and the haunting suspicion that something is profoundly amiss with Damien, the father embarks on a global investigation. His search for truth becomes an obsession, leading him to unearth alarming secrets tied to ancient prophecies and a sinister conspiracy that reaches far beyond his family. As unexplainable and terrifying events escalate, the realization that Damien may not be the innocent child he seems looms over the family, setting the stage for unthinkable choices and a confrontation with ultimate evil.