From Serbian snowfields to deserts in Afghanistan, four women unite across a century. Lilian, a surgeon in her fifties denied service in the Australian army in WW1 joins the Scottish Women’s Hospital. In WW2, Australian radiologist Mary finds herself the only woman among 3000 British troops in the Middle East. In Iraq doctor Tam, plagued by dreams of fleeing war-torn Saigon, reconciles her own refugee experience. Catherine, on active service in Afghanistan, reflects on the remarkable women who paved the way.