Adelaide Hills, Christmas Eve, 1959: At the end of a scorching hot day, beside a creek in the grounds of the grand and mysterious house, a local delivery man makes a terrible discovery. A police investigation is called, and 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. After her beloved grandmother, Nora, suffers a fall, Jess discovers a book at Nora’s house that chronicles the police investigation into a long-buried crime: the Turner Family Tragedy of Christmas Eve, 1959. It is only when Jess skims through the pages that she finds a shocking connection between her own family and this once-infamous event.