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Gibbs' arch-nemesis is suspected of being responsible for an explosion at a summit on global terror, but Gibbs chooses to sit out the investigation to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife's murder.
A mysterious illness sweeps through the city and infects hundreds of people, including Diggle. Oliver discovers the designer drug Vertigo in Diggle's blood and realizes that the Count has escaped from prison and is once again distributing the drug.
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Get to know the BAU's new agent