Missing teen Karlie Guse's mom raises questions: 'I just don't understand'

16-year-old Karlie Guse has been missing from her California home for more than a week and her biological mother Lindsay Fairley says she is not getting answers from investigators and others about her daughter. Nancy Grace talks to the mom in this episode. They are joined by Dr. Brian Russell, lawyer & psychologist, host of Investigation Discovery’s “Fatal Vows” series, forensics expert Joseph Scott Morgan, and reporter Robyn Walensky, author of Beautiful Life?: The CSI Behind the Casey Anthony Trial & My Observations." TOMORROW, Nancy interviews the step mother Melissa Guse and the bio dad Zachary as they share their side of the story.

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