Series Five Part One picks up with the aftermath of our heroes' victory over William. After having successfully banished him into the Void, Nathan and Duke are devastated to discover that the Audrey Parker they know and love has disappeared. In her place stands Mara, the unflinchingly malevolent "original" person responsible for creating the troubles many centuries ago. Finally freed from the confines of her do-gooder husks (Audrey, Lucy) Sarah, etc.), Mara proceeds to unleash a wave of chaos over Haven.