• Daily Mirror: ‘A thundering success…a triumph for Hercule Poirot.’

37. Elephants Can Remember (1972)

‘The Ravenscrofts didn’t seem that kind of person. They seemed well balanced and placid.’

And yet, twelve years earlier, the husband had shot the wife, and then himself—or perhaps it was the other way around, since sets of both of their fingerprints were on the gun, and the gun had fallen between them. The case haunts Ariadne Oliver, who had been a friend of the couple. The famous mystery novelist desires this real-life mystery solved, and calls upon Hercule Poirot to help her do so. Old sins have long shadows, the proverb goes. Poirot is now a very old man, but his mind is as nimble and as sharp as ever and can still penetrate deep into the shadows. But as Poirot and Mrs Oliver and Superintendent Spence reopen the long-closed case, a startling discovery awaits them. And if memory serves Poirot (and it does!), crime—like history—has a tendency to repeat itself.

• The Times: ‘Splendid.’

38. Poirot’s Early Cases (1974)

With his career still in its formative years, we learn many things about how Poirot came to exercise those famous ‘grey cells’ so well. Fourteen of the eighteen stories collected herein are narrated by Captain Arthur Hastings—including what would appear to be the earliest Poirot short story, ‘The Affair at the Victory Ball,’ which follows soon on the events of The Mysterious Affair at Styles. Two of the stories are narrated by Poirot himself, to Hastings. One, ‘The Chocolate Box,’ concerns Poirot’s early days on the Belgian police force, and the case that was his greatest failure: ‘My grey cells, they functioned not at all,’ Poirot admits. But otherwise, in this most fascinating collection, they function brilliantly, Poirot’s grey cells, challenging the reader to keep pace at every twist and turn.

Collected within: ‘The Affair at the Victory Ball’; ‘The Adventure of the Clapham Cook’; ‘The Cornish Mystery’; ‘The Adventure of Johnnie Waverly’; ‘The Double Clue’; ‘The King of Clubs’; ‘The Lemesurier Inheritance’; ‘The Lost Mine’; ‘The Plymouth Express’; ‘The Chocolate Box’; ‘The Submarine Plans’; ‘The Third-Floor Flat’; ‘Double Sin’; ‘The Market Basing Mystery’; ‘Wasps’ Nest’; ‘The Veiled Lady’; ‘Problem at Sea’; ‘How Does Your Garden Grow?’

• Sunday Express: ‘Superb, vintage Christie.’

39. Curtain: Poirot’s Last Case (1975)

Captain Arthur Hastings narrates. Poirot investigates. ‘This, Hastings, will be my last case,’ declares the detective who had entered the scene as a retiree in The Mysterious Affair at Styles, the captain’s, and our, first encounter with the now-legendary Belgian detective. Poirot promises that, ‘It will be, too, my most interesting case—and my most interesting criminal. For in X we have a technique superb, magnificent…X has operated with so much ability that he has defeated me, Hercule Poirot!’ The setting is, appropriately, Styles Court, which has since been converted into a private hotel. And under this same roof is X, a murderer five-times over; a murderer by no means finished murdering. In Curtain, Poirot will, at last, retire—death comes as the end. And he will bequeath to his dear friend Hastings an astounding revelation. ‘The ending of Curtain is one of the most surprising that Agatha Christie ever devised,’ writes her biographer, Charles Osborne.