The Murder of Roger Ackroyd

At the end of Agatha Christie's classic detective novel, The Murder of Roger Ackroyd, Hercule Poirot declares with a customary late flourish that the murderer is none other than the book's narrator. But the narrator is, by definition, suspect. So who can we believe? Roger Ackroyd knew too much. He knew that the woman he loved had poisoned her brutal first husband. He suspected also that someone had been blackmailing her. Now, tragically, came the news that she had taken her own life with a drug overdose. But the evening post brought Roger one last fatal scrap of information. Unfortunately, before he could finish the letter, he was stabbed to death!