We should not be afraid of the sky : a novel / Emma Hooper.

During the golden age of the Roman Empire, five girls enjoy a modest childhood in their small Portuguese village. They race each other through lemon orchards and pick fresh fruit for the commander who overlooks his people from a large house on the hill. Though the girls are all raised by different families, there is one thing they know without a doubt: they are sisters. What they don't know is that their simple existence is about to be irrevocably changed. When soldiers abduct them from their village and bring them to the commander, the sisters are suddenly forced to confront long-buried secrets that reveal their lives to be anything but ordinary. Burgeoning on womanhood just as the Empire begins to show signs of crumbling around them, they soon find themselves at the centre of a deadly standoff and must part ways to fight their own battles in order to survive.