Posie is the author of five novels, most recently The Island House. She has worked in the Australian film and television industry for the last thirty years creator and producer of hundreds of primetime television programs, including "McLeod's Daughters" and "Hi-5". She lives in Tasmania with her husband and creative partner, Andrew Blaxland.
Her first series of books, the Anne Trilogy, includes The Innocent, The Beloved and The Exiled. These three books were published in four years (between 2002 and 2006) which led to a short break in Posie's writing career. It would not be until October 2010 that The Dressmaker would be published, set in Victorian England. She has since published The Last to Know and The Island House.