A film adaptation of the novel by Agatha Christie, "The Murder of Roger Ackroyd." The owner of the mansion, Roger Ackroyd, was killed in his own office. The investigation is conducted by two - a local inspector and Belgian detective Hercule Poirot. Everyone is suspected: nephew, household, servants, guests. Everyone has an alibi and everyone conceals something, but at the same time hopes for Poirot and a fair outcome of the investigation. All but the true killer. But Poirot is not in a hurry, he patiently accumulates facts, gets rid of contradictions, frees everyone from a burdensome secret and remains face to face with the killer, facts, logic and a difficult human feeling - disappointment ....