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A woman found frozen at a construction site leads Beckett and Castle to reopen a cold case. The probe into the victim's past stirs up unpleasant memories for Beckett, which provides Castle with new book material.
The ninth season begins with poison gas being pumped into the CSI lab and one team member dying from the attack. The probe focuses on a bitter university professor who is suspected of killing some colleagues and wanted the case evidence to be destroyed.
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TVGuide.com editors break down theories about what's coming up on The Walking Dead