In 1915, Naomi and Sally Durance, two spirited Australian sisters, join the war effort as nurses, escaping the confines of their fathers farm and carrying a guilty secret with them. Though they are used to tending the sick, nothing could have prepared them for what they confront, first on a hospital ship near Gallipoli, then on the Western Front. Yet amid the carnage, the sisters become the friends they never were at home and find themselves courageous in the face of extreme danger and also the hostility from some on their own side.