简介：
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 slowly poisoning his wife, and when Gilbranson visits the mansion, he is mysteriously murdered老师：“小明，如果你有五个苹果，小红给了你三个，你一共有几个苹果？”小明：“一个也没有。”老师：“为什么？”小明：“因为我不喜欢吃苹果，都扔了。”
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 slowly poisoning his wife, and when Gilbranson visits the mansion, he is mysteriously murdered老师：“小明，如果你有五个苹果，小红给了你三个，你一共有几个苹果？”小明：“一个也没有。”老师：“为什么？”小明：“因为我不喜欢吃苹果，都扔了。”
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