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
The story resumes in London when Poirot receives an anonymous gift: a . This flower was a significant motif from that fatal night in Buenos Aires. Shortly after, Barton Russell contacts Poirot, revealing he has never believed Iris killed herself. To uncover the truth, Russell decides to recreate that tragic night exactly as it happened. The Re-enactment Poirot subtitles English S05E03
The Yellow Iris - Agatha Christie's Poirot (Season 5, Episode 3) In , Season 5, Episode 3, titled "