S1, E1: In 1926, with her writing in crisis and her personal life in tatters, a young Agatha Christie decides to solve a real-life murder. Based on her notorious eleven-day disappearance and an infamous unsolved killing, ‘Agatha Christie and the Murder of Florence Nightingale’ is a classic who-done-it revealing the origin story of the world’s best-selling novelist.When the goddaughter and namesake of Florence Nightingale is found on a train to Hastings with her skull caved in the subsequent investigation and public outcry fail to catch the killer. Driven to distraction by the lack of progress and the failure of the police, Florence’s partner of twenty-six years –Mable Rogers–begins her own investigation. But having found a number of suspects, Mable can not find proof which will expose the murderer. At her wit’s end she makes an appeal to the creator of Poirot, whose latest novel ‘The Murder of Roger Ackroyd’ is an international sensation.