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In page Hercule Poirot:

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Again, Poirot is not reliable as a narrator of his personal history and there is no evidence that Christie sketched it out in any depth. During his police career, Poirot shot a man who was firing from a roof into the public below.[6] In Lord Edgware Dies, Poirot reveals that he learned to read writing upside down during his police career.[citation needed] Around that time he met Xavier Bouc, director of the Compagnie Internationale des Wagons-Lits.