Adelaide Hills, Christmas Eve, 1959: A local delivery man makes a terrible discovery. The small town of Tambilla becomes embroiled in one of the most shocking and perplexing murder cases in the history of South Australia. Many years later, Jess is a journalist in search of a story. Having lived and worked in London for almost 20 years, she now finds herself laid off from her full-time job and struggling to make ends meet. She is summoned back to Sydney, where her beloved grandmother, Nora, has suffered a fall and been raced to the hospital. At Nora's house, Jess discovers a book that chronicles the police investigation into a long-buried crime: the Turner Family Tragedy of Christmas Eve, 1959. Jess skims through the pages and finds a shocking connection between her own family and this once-infamous event - a murder mystery that has never been resolved satisfactorily...