Marine Sgt. Nicholas Brody is now a U.S. congressman, and former CIA agent Carrie Mathison has returned to civilian life. But when a new and potentially devastating terrorist threat emerges, Brody and Carrie's lives become intertwined once again and they resume their delicate dance of suspicion, deceit and desire.

Carrie Mathison, a brilliant but volatile CIA agent, suspects that a rescued American POW may not be what he seems. Is Marine Sgt. Nicholas Brody a war hero or an Al Qaeda sleeper agent plotting a spectacular terrorist attack on U.S. soil? Following her instincts, Mathison will risk everything to uncover the truth - her reputation, her career, and even her sanity.

As Carrie and Saul search for the truth behind the bombing of CIA headquarters, lines are blurred between friend and foe and no one can be trusted. While hiding a stunning secret of her own, Carrie helps recruit Brody for a dangerous mission that could offer him a chance at redemption. But when the plan unravels and Brody is targeted deep inside Iran, he must put his life in Carrie's hands, leading to one of the most suspenseful and shocking season...