Curtain Poirots Last Case

There is something almost unbearably poignant about reading Curtain knowing what you know about how it came to exist. Christie wrote this novel during the Second World War, in the early 1940s, when London was being bombed and she genuinely did not know whether she would survive. She wrote it as a kind of insurance policy, a gift for her daughter Rosalind, locked it in a bank vault with instructions not to publish it until after her death, and then lived for another three decades. When it was finally published in 1975, just months before Christie herself died, it landed like a farewell note from someone who had been saying goodbye for thirty years without anyone knowing.
That backstory matters because it shapes the whole texture of the novel. Christie was not writing a puzzle when she wrote Curtain. She was writing an elegy, for Poirot, for Hastings, for Styles itself, for the entire golden age of detective fiction that she had done more than anyone else to create and define. And she was doing it while sitting in the rubble of a world that had just torn itself apart in a way that made genteel country house murders seem like a memory from another century.
The result is unlike any other book in the Poirot series. The mystery itself is genuinely ingenious, built around a concept so unsettling and so philosophically interesting that it could only work at the very end of a long series, when the reader knows Poirot well enough to feel the full weight of what Christie is asking him to do. The central idea is this: what do you do when you know with absolute certainty that someone is a murderer, has killed five people across different cases, and is about to kill again, but you have no evidence that any court in the world would accept? Poirot has spent his entire career answering that question with patience and process and trust in the law. In Curtain, for the first and only time, the law is not enough. And Poirot must decide, alone, what he is willing to do about it.
That moral weight is what elevates this book so far above most of Christie's work. It is not a comfortable read. Poirot does something in this novel that is genuinely shocking, something that forces you to reassess not just the plot but the entire character you thought you knew across forty-five books. Christie plants the clue for what he does quite openly, in a conversation that seems at the time like one of his usual philosophical tangents, and then she uses it. She commits to it fully. There is no softening of the consequences, no last-minute reprieve, no clever mechanical solution that lets everyone off the hook. The ending is devastating and earned and completely honest.
Hastings as narrator is more valuable here than he has been in many years. His limited understanding of what is actually happening around him, which in other Poirot novels can feel like a structural convenience, here becomes genuinely moving. He is watching his oldest friend and knowing something is wrong and being unable to name or fix it, which is one of the most recognizable experiences Christie ever wrote. His observations about Poirot's physical decline, about the way the great man sits in his chair and looks out windows and says less than he used to, are written with a tenderness that is completely unexpected from a writer who spent most of her career maintaining careful emotional distance from her characters.
The villain of this book is one of Christie's most genuinely chilling creations, not because of what they do but because of what they are. There is no melodrama, no theatrical evil. The danger is entirely psychological, entirely human, and entirely recognizable. And the way Christie reveals it, gradually and then all at once, is a masterclass in controlled disclosure.
This is not the book to read if you are new to Poirot. It requires the weight of the whole series behind it to land as it should. But for readers who have been with Poirot since the beginning, or even for a significant portion of his forty-five cases, Curtain is something close to essential. It is Christie at her most serious, her most morally courageous, and her most emotionally honest. She wrote it knowing she might not survive to publish it. That knowledge is on every page.