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In the character-based psychological thriller, "The Enemy Within," Erica Shepherd (Jennifer Carpenter) is a brilliant former CIA operative, now known as one of the most notorious traitors in recent American history serving life in a Supermax prison. Against every fiber of his being but with nowhere else to turn, FBI Agent Will Keaton (Morris Chestnut) enlists Shepherd to help track down a fiercely dangerous and elusive criminal she knows all too well. While Shepherd and Keaton have different motivations for bringing the enemy to justice, they both know that to catch a spy… they must think like one.