The Murder of Roger Ackroyd
by Agatha Christie

Poirot retires to a village near the home of a friend he met in London, Roger Ackroyd, who agrees to preserve his friend’s anonymity so he may pursue his retirement project of perfecting vegetable marrows. Poirot is not long at this pursuit when his friend is murdered, and it’s up to Poirot to find the truth.The novel was well-received; it is one of Christie's best known and most controversial novels, having had a significant impact on the mystery genre.