The Enemy Within is a fast-paced thriller set in the world of counterintelligence. It centers on Erica Shepherd (Carpenter), a brilliant former CIA operative, now known as the most notorious traitor in American history and serving life in a Supermax prison. Against every fiber of his being but with nowhere else to turn, FBI Agent Will Keaton (Chestnut) enlists Shepherd to help track down a fiercely dangerous and elusive criminal she knows all too well. For Keaton, it’s not easy to trust the woman who cost him so much. 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.
Who says our protectors don't have problems too. some of these cops are worse than criminals (Graceland) (Chicago PD) (Gang Related) and some of them deal with forces we can't understand (supernatural)(Lost Girl) (Beauty and the Beast). but there are those that are in a league of there own (the mentalist) (castle) (psych) (the closer). and those with amazing intellect (elementary) (bones) (scorpion) the one thing they all agree on is people are capable of anything given motive and opportunity. and all they have to do is PROVE IT!!