Jonathan is a very lonely man. One day, he gets a visitor in his house: a young woman who, through a jarring turn of events, ends up dead. He does not report it because he is happy to have a friend, but now the body begins to decay.
Marple is asked by her lawyer, Christian Gilbranson, to visit his step-mother, Carrie Louise Serrocold, an old friend of Miss Marple's, at her country estate. Carrie's husband, Lewis, confides to Miss Marple that he suspects someone is s…