Omen: Origin of the Omen by Arkasha Stevenson, the prequel to the 1976 film that started it all. Margaret (Nell Tiger Free), an American girl sent to work in an orphanage while waiting to take her vows.
The cast of Omen also includes Sonia Braga (Donna Flor and her two husbands) in the role of Sister Silva, abbess of the Vizzardeli orphanage in Rome. "In Sister Silva's mind, everything must always be in her place. She manages the convent with strength and order and treats all the children almost as if they were adults, but then something horrible happens"