Agatha Christie wrote this mystery for dog lovers. She was certainly one herself, dedicating the novel to her own pet. Captain Arthur Hastings, in his penultimate Poirot appearance (like Poirot, Curtain will be his last), again takes up narrative duties—along with, remarkably, the eponymous Bob, a wire-haired terrier who, upon careful inspection, declares Poirot ‘not really a doggy person.’ But Poirot is present to inquire into the natural-seeming death of Bob’s mistress, Miss Emily Arundell. Natural-seeming, except that Miss Emily had written Poirot of her suspicions that a member of her family was trying to kill her: a letter Poirot received too late—in fact, two months too late—to help. Poirot and Bob will sniff out the murderer nonetheless (and Bob will win a happy new home, with Captain Hastings who is, most decidedly, a ‘doggy person’).

Fair warning: Dumb Witness is best read after The Mysterious Affair at Styles; The Murder of Roger Ackroyd; The Mystery of the Blue Train; and Death in the Clouds—since the identity of the criminal in each is revealed in this novel.

• Glasgow Herald: ‘One of Poirot’s most brilliant achievements.’

18. Death on the Nile (1937)

Among the best-loved of Agatha Christie’s novels, Death on the Nile finds Hercule Poirot again trying to enjoy a vacation—this time aboard the S.S. Karnak, steaming between the First and Second Cataracts of the Nile, with stops at sites of archaeological significance. But Poirot (who, after all, had attempted to retire years before) seems to be perennially unlucky in his choice of holidays. Newlywed Linnet Ridgeway is, in the course of the journey, shot dead in the head, and Poirot has before him a boatload of suspects—and a useful sidekick in Colonel Race of the British Secret Service.

Of note: The producers of Murder on the Orient Express released a film version, also well received (though not by Mrs Christie, who had passed away two years prior), of Death on the Nile (1978), this time casting Peter Ustinov as Poirot.

• Daily Mail (of the novel): ‘Flawless.’

19. Appointment with Death (1938)

‘“I’m so sorry,” she said…“Your mother is dead, Mr Boynton.” And curiously, as though from a great distance, she watched the faces of five people to whom that announcement meant freedom…’

We have returned to the Middle East with Hercule Poirot, on our most colourful tour yet: to the Dome of the Rock, the Judean desert, the Dead Sea, and to Petra, ‘the rose-red city,’ that ancient place of heart-stopping beauty—but also of heart-stopping horror, for here sits the corpse of old Mrs Boynton, monstrous matriarch, loathed by one and all. A tiny puncture mark on her wrist is the only sign of the fatal injection that killed her. With only twenty-four hours available to solve the mystery, Hercule Poirot recalls a chance remark he’d overheard back in Jerusalem: ‘You see, don’t you, that she’s got to be killed?’