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. There is great bravery, humor, and compassion, too, and the inspiring example of the remarkable women they serve alongside. In France, where Naomi nurses in a hospital set up by the eccentric Lady Tarlton while Sally works in a casualty clearing station, each meets an exceptional man: the kind of men for whom they might give up some of their newfound independence if only they all survive.