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
Miss Marple also has a remarkable ability to latch onto a casual comment and connect it to the case at hand. In several stories, she is able to rely on her acquaintance with Sir Henry Clithering, a retired commissioner of the Metropolitan Police, for official information when required. Miss Marple never married and has no close living relatives. Her nephew, the "well-known author" Raymond West appears in some stories including "Sleeping Murder" and "Ingots of Gold", which also feature his wife Joan, a modern artist (though prior to their marriage she is referred to as "Joyce Lemprière", in "The Thirteen Problems" stories).