Quick recap
Poirot has retired to the village of King's Abbot to grow marrows, but the peace doesn't last. The widow Mrs Ferrars kills herself, and wealthy Roger Ackroyd, who meant to marry her, gets a letter naming her blackmailer. That night Ackroyd is stabbed in his study. His stepson, Ralph Paton, vanishes and becomes the prime suspect. The local doctor, Dr Sheppard, narrates and helps Poirot investigate. In the end Poirot reveals that the narrator himself is the killer and the blackmailer, and that he used a dictaphone to fake an alibi. To spare Sheppard's sister Caroline, Poirot lets him choose his way out: the book we've read is his confession, written before he takes his own life.
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