expresses concern that Brody is the POW he was describing. With the CIA having no cause to investigate Brody, Carrie conducts her own unauthorized surveillance using a one-month FISA warrant delivered by Saul. Initially, Carrie finds no evidence of Brody's involvement with terrorism. When her FISA warrant expires, Carrie takes to making personal contact with Brody instead. She bumps into Brody at a veterans' support group, where they strike up a conversation and immediately bond over their mutual experiences in the Middle East. Brody asks Carrie to have a drink with him one night, culminating in a drunken sexual encounter in Carrie's car. The next day, he is brought to Langley for a polygraph over the apparent suicide of Afsal Hamid (Waleed Zuaiter), a detained terrorist with whom Brody had a violent confrontation. Carrie, suspicious of Brody's replies, tells the interviewer to ask if he has ever been unfaithful to his wife. Brody says "no", beating the polygraph. Afterwards, Carrie and Brody drive to her family's secluded cabin to spend the weekend together. However, after Carrie mentions his preference for Yorkshire Gold tea, which she learnt about through surveillance, Brody realizes she has been spying on him. She forces him to admit to his conversion to Islam, his meeting with and personal affection for Nazir, and his murder of a fellow POW named Tom Walker under duress. As Brody leaves, Saul contacts Carrie and informs her that Walker (Chris Chalk) is alive and was the POW who was turned. Carrie tries to apologize to Brody, but he rebuffs her and goes back to his family. The investigation into Walker leads Carrie and Saul to Mansour al-Zahrani (Ramsey Faragallah), a Saudi diplomat who acts as Nazir's intermediary. Carrie blackmails al-Zahrani into arranging a meeting with Walker at Farragut Square. However, the meet ends in disaster when Walker detonates a briefcase bomb carried by a double, killing al-Zahrani and three bystanders. Carrie is injured in the explosion, leading to a severe manic episode that causes her to be hospitalized. Upon learning of her affair with Brody, Estes — already under pressure by Vice President William Walden (Jamey Sheridan) to find a scapegoat for the bombing — dismisses Carrie from the CIA. Carrie deduces the target of Walker and Nazir's upcoming attack: Walden's upcoming policy summit at the State Department. When Walker stages a sniper attack on the dignitaries, Brody, Walden, and Estes