" What are all these people, by the way?” “They’re people whose gardens verge on or touch the garden of the house where the murder was committed.” “Sounds like a French exercise,” said Beck. “Where is the dead body of my uncle? In the garden of the cousin of my aunt. What about Number 19 itself?” “A blind woman, a former school teacher, lives there. She works in an institute for the blind and she’s been thoroughly investigated by the local police. "

― Agatha Christie , The Clocks (Hercule Poirot, #30)