The Augean Stables
One of Poirot's labours - when the Home Secretary uses the phrase "The Augean Stables", Poirot decides to assist the current Prime Minister in keeping his good name clear. From The Labours of Hercules.
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The Prime Minister fears his name will be sullied by an expose in X-Ray News, which will reveal his father-in-law, the previous Prime Minister, of underhand dealings and misusing party funds, but Poirot is uninterested. However when the Home Secretary uses the phrase "The Augean Stables", Poirot leaps on the opportunity to tackle the fifth task of his namesake.
First published in 1940 in the UK in Strand Magazine. It was included in the collection The Labours of Hercules in 1947, which was adapted for TV in 2013, as part of the final series of Agatha Christie's Poirot.