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Seth and the farmers take on the Black Legion with help from unlikely allies.
Prentiss prepares for a final showdown with her nemesis, Ian Doyle, and the team asks J.J. to return and assist them as they try to help Prentiss.
Ben Gates is off on another treasure hunt in this sequel involving a missing page from John Wilkes Booth's diary, which leads to a globe-trotting race to find an ancient city of gold.
Strange murders in Los Angeles are investigated; and Prentiss discloses more of her past.
Mysterious disappearances in upstate New York are investigated.
The parents of an autistic boy vanish and Reid's connection with the child could help the agents find his parents. Meanwhile, Prentiss asks two former Interpol colleagues to track down a nemesis from her past.
Prentiss believes her old Interpol nemesis is behind a series of murders and that he's close to her, which means the entire team's safety is threatened.
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