Agatha Christie. AT BERTRAM'S HOTEL. William Collins, 1965.
A young woman, her estranged mother, Miss JANE Marple, and an absent-minded clergyman are all staying at an old-fashioned Edwardian-style hotel in London in the 1960s. Miss Marple is afraid the young woman is being exploited. Others are concerned that the clergyman is missing. The police become suspicious. They notice anomalies in licence plate numbers, cars parked nearby, unconfirmed sightings of famous people around a series of armed robberies. They investigate the ownership of the hotel, the background of staff, the proximity of suspicious characters. Miss Marple is the eyes and ears; she shares what she has seen and heard when asked. Then, someone is murdered.