> ## Content Index
> Fetch the complete content index at: https://www.cascadepbs.org/llms.txt
> Use this file to discover other available public pages before exploring further.

# The Third Girl
- URL: https://www.cascadepbs.org/show/agatha-christies-poirot/episode/the-third-girl-ysugma/
- Published: 2025-09-17T22:21:54.000Z
- Updated: 2026-05-25T09:06:25.000Z
- Description: An heiress tells Poirot she may have killed someone, but Poirot uncovers a conspiracy.
- Author: Cascade PBS Staff
- Tags: Agatha Christie's Poirot, Season 11, Episode 3, #ZZZ_Episode_6a6e966c-25b2-4633-8128-37cf6d73e6ea, #episode, #ZZZ_Show_b625189f-cac1-40be-b296-52d193ea9b0a, #v1.16

When the young heiress Norma Restarick tells Hercule Poirot that she may have killed someone, it seems she’s telling the truth--her childhood nanny is soon found dead and those close to Norma fear for her sanity. With crime novelist Ariadne Oliver, Poirot uncovers a conspiracy rooted in a tragic family history and finally has to take life and death into his own hands to reveal the shocking truth.