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 return, FBI agent Will Keaton invites Shepherd to help track down a critical and evasive murderer he knows all too well. While Shepherd and Keaton have different motivations to bring the enemy to justice, they both know that in order to catch a spy … they have to think like one.