Leighton Meester as Karen Camden

Episodes 1

8.0

Dark Matter

2x19
September 3, 2007

Don and his team investigate a school shooting. He learns two students could have a strong motive, so Charlie uses the school's radio frequency identification system to track the shooters' movements through the school's hallways. When Charlie detects an abnormal pattern, the agents take a look at the evidence and discover a third participant no one had suspected earlier.

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