The Enemy Within Canceled NBC Series Not Returning for Season 2

Tal's war on the CIA expands to two fronts. Keaton and the Cointel team must locate the domestic target before Chigorin launches an all-out assault on the unsuspecting innocents. Shepherd convinces Keaton to let her go to Cuba to thwart Tal's attack on Sierra Maestra, the CIA's secret detention center imprisoning his operatives. Shepherd's ever-shifting allegiance raises the question if she is there to stop Tal or join him?

Acting on urgent intelligence from a captured Tal contact, Keaton and his team are able to intervene and stop the assassination of a high-profile congresswoman. Keaton has Shepherd interrogate the congresswoman, who had previously used Shepherd's treason conviction as a launching pad for her political career, leading to a stunning truth about the origins of Tal.

When a highly sophisticated Tal operative (guest star Michael James Shaw) evades FBI custody and flees to the Swiss embassy, Keaton and the Cointel team must go undercover. What begins as a smooth counterintelligence operation quickly devolves into a tense hostage situation.

When a group of contractors working for the CIA are murdered on board their chartered plane, Keaton and his team discover there are secrets the CIA is keeping from the FBI regarding Tal. Shepherd's ex-husband finds out that Hannah has been lying to him and visiting Shepherd regularly.

After a major Tal operative escapes CIA custody, Shepherd returns to Langley to help track the fugitive down; Shepherd and Keaton discover the CIA is withholding vital information on Tal, so they spy on the CIA to find out what the agency knows.

Flashbacks to the past reveal the fateful events that led CIA Deputy Director Erica Shepherd to betray her country and the ensuing investigation that put her on a collision course with Will Keaton.

When the FBI intercepts stolen NSA software intended for Tal, Keaton uses the technology as an opportunity to go on the offensive and sends Shepherd undercover to pass the technology to the intended recipient, a 19-year-old computer genius (guest star Stephen Friedrich). Keaton must choose between catching Tal or saving the life of an innocent teenager.

After a bomb explodes in Jersey City, the Cointel team captures a key planner, Sam Fathi, who can lead them to Tal, the mastermind behind the bombing. When Sam proves difficult to break, Shepherd convinces Keaton to detain a former Egyptian intelligence officer to help, leading to an urgent mission to stop another bomb from going off.

Once Shepherd convinces Keaton that Anna Cruz is a mole inside the FBI working for Tal, Keaton decides to keep his enemies close. With a fox in their henhouse, Keaton and the team spy on one of their own hoping Cruz will lead them to Tal.

When intelligence obtained by Shepherd during her stint at the notorious ADMAX prison is linked to a pending attack on U.S. soil, Keaton and the Cointel team embark on a manhunt to find and stop a deadly international operative. Keaton confronts questions of loyalty and betrayal when it comes to Anna Cruz and his late fiancée's father, Thomas Heffron.

Following the discovery that a U.S. ambassador is selling classified intelligence to a Colombian cartel, Shepherd devises a plan to catch him that will push Keaton's moral code to the brink. Keaton brings a new member on to the team.

When a former CIA operative is murdered, Keaton enlists Shepherd to help recover valuable intel that could take down Tal once and for all. But the question remains, can Shepherd be trusted?

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. 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.