The only person who can unravel the terrible events in The Murder of Roger Ackroyd is Hercule Poirot. He sets about, in his usual meticulous and eccentric way, to uncover the truth.

In an English village, a young widow, Mrs Ferrars is found dead; she has taken her own life. Roger Ackroyd confides to his friend, Dr James Shepherd, who is the narrator of the book, that he was planning to marry Mrs Ferrars. But before her death he discovered that she had a dark secret; she killed her own husband and now someone is blackmailing her. Then, just as Ackroyd is about to find out the identity of the blackmailer, he’s murdered.