The Grease Spot Revelation

Poirot confronts Countess Andrenyi, revealing that her passport's grease spot conceals the initial H—Helena, not Elena. She admits she is Helena Goldenberg, the younger sister of Sonia Armstrong. She and her husband altered the passport to avoid suspicion. She swears she did not kill Ratchett, and her husband confirms her alibi. Poirot begins to see the conspiracy taking shape.