When US Marine Sergeant Nicholas Brody is rescued after being help captive in Afghanistan, CIA operations officer Carrie Mathison suspects that Al Qaeda have enlisted him as a sleeper agent.

An undercover agent hands over new evidence to Carrie, who is keeping an eye on the surveillance footage of Brody's home.

The FBI mole in the Prince's entourage, Lynn, is assassinated. Meanwhile, the Brody family prepares for an interview at their home, while father and daughter get closer, and Agent Carrie Mathison witnesses awkward intimate moments of the Brody couple on the surveillance cam.

With the warrant running out of time, Carrie's team must pull all video surveillance from the Brody house.

Brody confronts his captor during a CIA interrogation. What happens adds to Carrie's suspicion that Brody isn't a hero after all.

Reeling after losing key players in Nazir's plot against America, the CIA order polygraph tests on everyone who came in contact with them, including Brody, which Carrie sees as an opportunity to finally learn the truth.