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In page Curtain: Poirot's Last Case:

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Christie wrote the novel in the early 1940s, during the Second World War. Partly fearing for her own survival,[citation needed] and wanting to have a fitting end to Poirot's series of novels, Christie had the novel locked away in a bank vault for over thirty years. In the same way, she wrote and locked away Miss Marple's "last" case via the manuscript which was later retitled “Sleeping Murder”. Dame Agatha legally gave the rights to the "last" Poirot novel to her daughter Rosalind and gave the rights to the "last" Miss Marple novel to her second husband Max.