When Dimp Bettany, a Sydney film producer, comes into possession of her ancestor John Bettany's journals, she believes she has finally found the subject of her next masterpiece. Even her more detached sister Prim, an aid worker in the Sudan, becomes intrigued as the story unfolds of how John Bettany carved out a living in the wilds of New South Wales in the 1840s, and of the internment in the notorious Female Factory of Sarah Bernard, the convict woman he was destined to meet. As John's and Sarah's paths converge, each sister finds her life cast in a new and galvanising light.