一位传记作家要为一个显赫的家族做传，因而登门拜访准备材料。然而在这期间，他们邻居的一个被杀，看门人的儿子因此被捕。但作家认为他是无辜的。所以他调查并得出凶手就在这个家族中的结论。
遇播放卡顿或无法播放时，可切换线路播放
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