1. At Bertram's HotelLondon, the mid 1950s. Miss Marple is staying at Bertram's Hotel in London. She loved the place as a girl and is delighted to find it remarkably unchanged. In fact, everything is too perfect. Beneath the well-polished Edwardian facade, Miss Jane Marple can sense something sinister. 2. NemesisSet in the mid 1950s, Nemesis was Agatha Christie's last and one of her most complicated MissMarple stories. A recently dead friend asks Miss Marple to investigate a crime.There are no clues,just a coach tour of historic homes and gardens. Murder is on the itinerary.3. 4.50 From PaddingtonElspeth McGillicuddy is travelling on the 4.50 train from Paddington, London to St Mary Mead to visit her old friend, Miss Marple. On the way, the train draws to a halt and another train draws alongside it. In the carriage opposite, the window blind suddenly snaps up, revealing a tall, dark man strangling a woman to death. Almost immediately the train chugs away, leaving a shocked Mrs McGillicuddy to realise that she has witnessed a murder.