"Sisters of War" was inspired by real events and based on Rod Miller's manuscript "The Lost Women of Rabaul". At the heart of those events were the stories and experiences of Lorna Johnston and Sister Berenice Twohill. In the process of clearing possessions for an estate in 1991, Miller, who is a general auctioneer, came across an old diary. He was about to throw it out when he became intrigued by the contents of the modest book. On closer inspection he saw that it was written in cryptic prose and rhyme. The diary was written by Grace Kruger, one of four civilian nurses captured by the Japanese in Rabaul in 1942. Kruger had deliberately written the diary with cryptic prose so as to confuse any Japanese soldier or casual reader who might have discovered it. Miller became fascinated by this work and the history that motivated it. Discovering there was little information readily available about the Rabaul nurses, he started to research the events surrounding their internment in Rabaul. Miller first met Sister Berenice Twohill and Lorna Johnston in 1997 and through them was able to meet and interview most of the surviving nurses and officers of Lark Force. He was able to borrow and transcribe their diaries which added to the overall knowledge of what had occurred at the time. Miller and writer John Misto joined forces on the project and soon after ABC1 came on board and producer Andrew Wiseman joined the team. Wisemen has an interest in presenting history dramas for television and "Sisters of War" provided a natural progression from "Curtin", the World War II telemovie he produced with Richard Keddie.