Carrie makes a vital choice when her counterpart in Islamabad gives her urgent intelligence resulting in a media disaster. Saul has issues with his new position/job.
An inquiry brings Carrie back to the US where she has issues debating between her motherhood duties and her commitment to solving the drone strike issue. Quinn becomes more mentally unstable and an old case worker reveals new information.
Carrie attempts to recruit an asset and leaves the US again. Quinn has further issues and communicates with the lady he previous protected and the CIA question his resignation.
Carrie gets a tip from Redmond regarding Quinn's lead. Saul calls in a favor with an old friend in the Pakistani military. Fara uncovers a deep-rooted conspiracy.
Carrie tries to earn the trust of a frightened asset. On his way out of town, Saul catches a break when he spots a familiar face. Quinn and Fara stake out a new suspect.
Carrie puts her operation in motion.
Lockhart arrives in Islamabad to help negotiate Saul's release. Meanwhile, Carrie's investigation gets complicated as she deals with Saul's situation, the search for a hospital employee with the key to Haqqani's true medical condition and a serious threat to her own sharp focus.
Carrie organizes a last-ditch operation. Lockhart and Martha stall the ISI.
Carrie improvises to salvage her mission; the CIA closes in on a leak
The security breach at the Embassy has far reaching consequences.
Carrie puts her life on the line to get her team out of Pakistan.
Series 4 ends with Carrie and Saul returning to the U.S. and investigating what she saw in Islamabad.