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First broadcast at 18:35 27 Aug 2011
The team investigates the apparent suicide of a Pentagon cryptographer.
Abby is almost killed while investigating a seemingly routine case.
The body of a missing marine is found in a frozen lake along with three other corpses.
The team must stop a teenage student from detonating a bomb attached to his body and get the other students who have been taken hostage to safety.
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Channel 5 Broadcasting Ltd. 2015