A murder tableau staged for Poirot’s ‘amusement’ goes horribly wrong at The Hollow, the estate of Lady Lucy Angkatell, who has invited the great detective as her guest of honour. Dr John Christow was to have been ‘shot’ by his wife, Gerda, to ‘expire’ in a pool of blood-red paint. But when the shot is fired, it is deadly, and Dr. Christow’s last gasp is of a name other than his wife’s: ‘Henrietta.’ What was to have been a pleasant country weekend becomes instead one of Poirot’s most baffling cases, with the revelation of a complex web of romantic attachments among the denizens of The Hollow.

Of note: The phenomenon of The Mousetrap tends to distract from Agatha Christie’s other stage successes. An adaptation of The Hollow was one such triumph, premiering in Cambridge in 1951 and subsequently playing for over a year in the West End. Poirot, however, is not a character in the stage version—the diminutive Belgian with the oversized personality was replaced by a perfectly neutral Scotland Yard inspector. In her Autobiography, Mrs Christie notes that she wishes she had made a similar swap in the novel—so rich are the characters in The Hollow—but Poirot fans then (The Hollow was a tremendous bestseller) and today would have it no other way.

• San Francisco Chronicle (of the novel): ‘A grade-A plot—the best Christie in years.’

26. The Labours of Hercules (1967)

Dr Burton, Fellow of All Souls, sipping Poirot’s Chateau Mouton Rothschild, offers up a rather unkind remark about his host that sets in motion Hercule Poirot’s obsessive, self-imposed contest against his classical namesake: Poirot will accept twelve labours—twelve fiendishly complex cases—and then, at long last, genuinely unshoulder the burdens of the hero: he will retire, and leave the ridding of society’s monsters, the sweeping of its criminal stables, to others. The cases that Poirot engages are every bit as taxing of his mighty brain as were the famous labours imposed by Eurystheus, King of Tiryns, on the Greek demi-god’s brawn, and they make for one of the most fascinating books in the Christie canon. (Poirot solves them all but, of course, retirement remains as elusive as ever.)

• Sunday Express: ‘Twelve little masterpieces of detection. Poirot and Agatha Christie at their inimitable best.’
• Margery Allingham: ‘I have often thought that Mrs Christie was not so much the best as the only living writer of the true classic detective story.’
• San Francisco Chronicle: ‘A finely shaped book, richly devious and quite brilliant.’

27. Taken at the Flood (1948)