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Poe’s employment of the ‘obvious solution’ of hiding in plain sight (using a letter-rack as the hiding place of a letter) is adopted, though not as a solution, by Christie in ‘The Nemean Lion’, the first of The Labours of Hercules. The solutions to, for example, The Murder at the Vicarage, Death on the Nile, Evil under the Sun and The Hollow, among others, all unmask the most obvious culprits even though it seems that they have been cleared early in the story and have been dismissed by both detective and reader. In An Autobiography, Christie writes: ‘The whole point of a good detective story is that it must be somebody obvious but at the same time, for some reason, you would find that it was not obvious, that he could not possibly have done it. Though really, of course, he had done it.’

So, Christie’s output adhered to most of the conditions of Poe’s initial model, while simultaneously expanding and experimenting with them. Although Poe created the template for later writers of detective fiction, early in the twentieth century two practitioners formalised the ‘rules’ for the construction of successful detective fiction. But these formalisations, by S.S. Van Dine and Ronald Knox, writing almost simultaneously on opposite sides of the Atlantic, merely acted as a challenge to Agatha Christie’s ingenuity.