In 1915 sisters Naomi and Sally Durance answer a call for nurses to join the war effort. They are escaping the family dairy farm in the Macleay Valley, and they carry a secret with them. Soon they are in Egypt, where they are put to work on the Red Cross hospital ship Archimedes as it patrols the Dardanelles. On Archimedes they witness Mars in all his ferocity, as he pummels soldiers in the massive, brutal metal brawl that is Gallipoli. Yet the sisters and their newfound nursing friends, with whom they will witness undreamt-of carnage and take care of unspeakably blighted men, find themselves courageous in the face of the horror. Naomi, Sally and their gang are then sent to northern Europe, where Naomi nurses in the visionary Australian Voluntary Hospital run by the committed and eccentric Lady Tarlton, and Sally in a casualty clearing station next to the Western Front. Here, again, they must face the inhumanity of war in its many terrible guises - where trench warfare and gas abound.