When Roger Ackroyd is found murdered in his study at Fernly Park, the peaceful village of King's Abbot is plunged into turmoil. Ackroyd had discovered that his recently deceased friend, Mrs. Ferrars, was being driven to suicide by an unknown blackmailer who held the secret of her husband's murder. Before Ackroyd could read a final confession letter detailing the blackmailer's identity, he is stabbed to death in a locked room.
The investigation falls to Hercule Poirot, who has retired to the village to grow vegetable marrows. Suspicion immediately fastens on Ackroyd's missing stepson, Ralph Paton, who stands to inherit a vast fortune and is burdened by severe debts and scandalous entanglements. However, Poirot's methodical mind rejects obvious conclusions, digging beneath the surface respectability of the household.
Every person in the orbit of Fernly Park—from the polished secretary Geoffrey Raymond to the stern housekeeper Miss Russell and the ambitious niece Flora—harbors secrets, debts, or hidden fears. As Poirot probes deeper, the boundary between village gossip and genuine criminality blurs. The investigation moves through meticulous tracking of timelines, footprints, Canada connections, and mysterious telephone calls from the station. Slowly, Poirot peels back the layers of deception, exposing how ordinary human weakness can warp into desperation and violence, leading toward an astonishing revelation that redefines every clue laid down from the very first page.