Murder, betrayal and decadence in Egypt's dying days. Egypt, 164 BC. A bull that is worshipped as a God dies. Two children, twin girls, are plucked from poverty to become virgin priestesses of the Apis Bull cult. Their mother has abandoned them, and their father has been murdered. As handmaidens to the dead bull, they may be saved from a life of poverty and prostitution - but not if their mother has her way. The true story of the sacred twins is told in a letter they wrote to the Pharaoh over two thousand years ago. It's a tragic tale of greed and betrayal that unfolds in the shadowy underworld of the great temple city of Saqqara in the last decades of the Egyptian empire.

• Jeremy Sisto