The Burtons, brother and sister, arrive in the small town (or village) of Lymstock in Devon, and soon receive an anonymous letter accusing them of being lovers, not siblings. They are not the only ones in the village to receive such letters. A prominent resident is found dead with one such letter found next to her. This novel features the elderly detective Miss Marple in a relatively minor role, "a little old lady sleuth who doesn't seem to do much". She enters the story in the final quarter of the book, in a handful of scenes, after the police have failed to solve the crime.