'The Adventure of the Egyption Tomb'
SeaSnap Cornwall, United Kingdom
The short story in question is one of my favourites from 'Poirot Investigates'. It has also been included for Agatha's story in the Mystery collection 'WhoDunnit'. Post your comments on it here.
With 'The Kidnapped Prime Minister', it's the bit when they "siege" the house, and the woman commits suicide. With 'The Adventure of the Italian Nobleman', it's the addition of all the government and blackmail. None of these events were prominent in the short stories.