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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... (more) an abnormal pattern, the agents take a look at the evidence and discover a third participant no one had suspected earlier.

Ben Campbell, Christine Estabrook, Daniel Booko, Jesse Head, Kate Linae, Leighton Meester, Marin Mazzie, Mary Gordon Murray, Nathan Keyes, Rob Moran