Quick recap
Jerry Burton, a pilot injured in the war, goes to quiet Lymstock to recover with his sister, Joanna, and narrates the story. Soon the two get an anonymous letter saying they aren't siblings but lovers. Mrs. Symmington, the lawyer's wife, is found dead with one of them and a suicide note. Then the maid, Agnes, is murdered. The vicar's wife calls in Miss Marple. She proves the letters were a smoke screen: the killer is Richard Symmington himself, who wanted his wife out of the way so he could have the governess, Elsie Holland. A trap using his stepdaughter, Megan, exposes him. In the end, Jerry marries Megan, and Joanna marries the doctor, Owen Griffith.

