: Contrast the "immortal" detective of earlier books with this version: frail, immobilized by arthritis, and suffering from a heart condition. Despite his physical decay, his "little grey cells" remain sharp.

: Note that the story returns to Styles Court in Essex, the location of Poirot and Hastings' first case together in The Mysterious Affair at Styles .

: Suggest that Curtain is not just a murder mystery, but a meditation on the limitations of the law and the moral weight of justice , forcing Poirot to subvert his own lifelong principles to stop a "perfect" killer. 2. Character Profiles & Evolution

: Focus on Stephen Norton . He is a "psychopathic criminal" who doesn't kill directly but manipulates others into doing so, making him legally untouchable—a unique challenge for Poirot. 3. Key Themes for Analysis

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