Volatile CIA agent Carrie Mathison investigates and ultimately becomes obsessed with returned POW marine Nicholas Brody, who may or may not be an al-Qaeda-trained terrorist. Brody struggles to resume his domestic life with his wife and two children whom he barely knows. Saul tries his best to support his bipolar protégé while pursuing leads of his own and trying to hold his crumbling marriage together.

Carrie goes to extraordinary lengths to solve the latest crisis at the CIA while dealing with a deeply personal secret. Brody struggles to survive. Saul must walk a tightrope and play many opposing sides to keep his job at the CIA and try to revive his troubled marriage. Quinn has a crisis of faith.