The story takes place at 6: 00 a. M. on June 6, 1966, when American Ambassador Robert (Gregory Parker Gregory Peck) adopts a boy and names him Demi (Harvey Stephens Harvey Stephens). As time went on, Dami grew up, and the spate of strange events heralded the doom that knocked on Robert's door. After Dami's babysitter inexplicably committed suicide, a mysterious woman Belloc (Billie Whitlow Billie Whitelaw) volunteered to stay with Demi. After that, Father Bonan (Patrick Stratton Patrick Troughton) finds Robert and tells him that Demi is the child of Satan and that Demi will do whatever it takes to achieve his ambition to rule the world. Robert was skeptical about the priest's words, and it wasn't until the news of Father Bonan's death that Robert realized how bad things were going.
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