In the years since Kathie Durst disappeared, no progress has been made in finding out what happened to her. Then, a breakthrough: a voicemail from Susan Berman's son Sareb Kaufman holds a crucial piece of evidence that could be the key to solving the mystery. Andrew seeks advice from former OJ prosecutor Marcia Clark, and decides to confront Bob, putting him back in the hot seat for an interview that could change everything.

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