They appear together in four full-length novels and one collection of short stories. Their other appearances were in Partners in Crime, a 1929 collection of short stories (each reminiscent of another writer's work); N or M? , a 1941 espionage novel; By The Pricking of My Thumbs (published in 1968); and Postern of Fate in 1973, the last novel Christie ever wrote (although not the last to be published).
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