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In page The Mystery of the Blue Train:
"It later had an effect on her in the midst of wartime when, nervous that at some future point she might be in need of funds and need a fallback, she wrote Sleeping Murder and locked it securely in a bank vault for future publication.[5] Curtain was written at the same time and similarly locked away, but publication of this latter book would not be possible until the end of her writing career, as it recounts the death of Poirot.[citation needed]
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