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.
Elenco: David Krumholtz , Rob Morrow , Peter MacNicol , Judd Hirsch , Navi Rawat , Alimi Ballard , Dylan Bruno , Aya Sumika , Sophina Brown , Judd Hirsch , Peter MacNicol , Sabrina Lloyd , Sophina Brown .