Agatha Christie a long-running character in Christie's works, appearing in 33 novels and 54 short stories. Miss Jane Marple, introduced in the short-story collection "The Thirteen Problems" in 1927, was based on Christie's grandmother and her "Ealing cronies". Both Jane and Gran "always expected the worst of everyone and everything, and were, with almost frightening accuracy, usually proved right." Marple appeared in 12 novels and 20 stories. During the Second World War, Christie wrote two novels, "Curtain" and "Sleeping Murder", intended as the last cases of these two great detectives, Hercule Poirot and Miss Marple. Both books were sealed in a bank
Agatha Christie page of the paper on 6 August 1975. Following the great success of "Curtain", Christie gave permission for the release of "Sleeping Murder" sometime in 1976 but died in January 1976 before the book could be released. This may explain some of the inconsistencies compared to the rest of the Marple series—for example, Colonel Arthur Bantry, husband of Miss Marple's friend Dolly, is still alive and well in "Sleeping Murder" although he is noted as having died in books published earlier. It may be that Christie simply did not have time to revise the manuscript before she died. In 2013,