YMMV: Five Little Pigs
- Moral Event Horizon: Subverted. The murder of Amyas and framing of Caroline at first appears to be this, but by the end of the story, the murderer's empty, joyless life and hopeless outlook come across as quite pitiable, a fact which is lampshaded by Poirot himself.
- Tear Jerker: Caroline dies in vain, thinking she's protecting her own sister, when really, she accidentally protects the woman who killed Caroline's husband and blamed Caroline the whole time.
- Miss Williams was very much on Caroline's side and withheld what she thought was incriminating evidence at the trial, not knowing that that evidence would actually have exonerated Caroline.