I nominated The Murder of Roger Ackroyd by Agatha Christie, #4 in her Hercule Poirot series. I have read a number of Christie's mysteries, and this is my favourite. There is a lovely twist in the plot that will keep you guessing as to the murderer. In fact, a number of popular modern mysteries have a shared characteristic with this story, and it is one that fascinates me, but to say more would be a bit of a spoiler.
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