The Ice House (1978)
Paul recently divorced seeks sanctuary at a country retreat run by a sinister brother and sister
Agatha Christies Miss Marple 450 from Paddington (1987)
A friend of Miss Marples sees a woman being strangled in a passing train When police cannot find a body and doubt the story, Miss Marple enlists professional housekeeper, Lucy Eyelesbarrow, to go undercover