Immediately after their miscarriage, the US diplomat Robert Thorn adopts the newborn Damien without the knowledge of his wife. Yet what he doesn’t know is that their new son is the son of the devil.

Wife iI Thorn, Kathryn, has gone through a difficult birth and still does not know that the baby is dead. Although he is destroyed by this loss, Thorn’s main concern is for Kathryn, who has already suffered two miscarriages. The hospital priest shows Thorn another baby who was born that night and who lost his mother, who died in childbirth. The priest convinces Thorn to recognize the child as them: Kathryn will never know the truth and the son, whom they call Damien, will be raised as the fruit of their blood and flesh. But some facts, all of which can be connected to Damien, who is only five years old at the time, are downright disturbing. Damien is not a child like others, but the Antichrist who has long been prophesied…