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The Enemy Within is a character-driven investigative thriller set in the world of counterintelligence. It focuses on former CIA agent Erica Shepherd, the most notorious traitor in modern history and most hated woman in America, who is brought out of a federal supermax prison by the FBI to help stop some of the most dangerous acts of espionage threatening the United States today.
Erica Shepherd is a brilliant former CIA operative, now known as the most notorious traitor in American history serving life in a Supermax prison. Against every fiber of his being but with nowhere else to turn, FBI Agent Will Keaton 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.