In , Season 5, Episode 3, titled " The Yellow Iris ," Hercule Poirot is drawn into a cold case that began two years earlier in Buenos Aires. The Backstory: Buenos Aires
Poirot, who was present at the restaurant, intervenes. He reveals that Pauline is not dead; he had anticipated the killer's move and switched the poisoned glass. Poirot then exposes as the murderer. Poirot subtitles English S05E03
The Yellow Iris - Agatha Christie's Poirot (Season 5, Episode 3) In , Season 5, Episode 3, titled "