"Homeland" airs Sundays at 9 p.m. ET on Showtime. Showtime

Season 4 of “Homeland” kicked off with an explosive two-episode premiere Sunday night, but it won’t even hold a candle to the next installment. After a brief return to the U.S., Carrie Mathison (Claire Danes) is back in the Middle East for episode 3, working in her new role as Islamabad, Pakistan, station chief. Showtime’s synopsis for "Shalwar Kameez" hints that Carrie will connect with a “key asset” in her quest to uncover the truth about her late co-worker CIA chief Sandy Bachman's (Corey Stoll) “dark” sources and what really happened prior to the deadly wedding drone strike against terrorist Haissam Haqqani. Carrie’s partner, Peter Quinn (Rupert Friend), will also reportedly zero in on a potential lead.

Just who is Carrie’s new source? It appears one of the few drone strike survivors, Haqqani’s nephew Aayan Ibrahim (Suraj Sharma), may be her new asset in Pakistan.

“You’re in trouble, Aayan,” Carrie tells the college student in an episode preview. She is later seen trying to convince him to divulge details about the incident, despite being threatened not to speak out. “You are part of an important story,” she says. “I want to be the one to tell it.”

With Aayan’s cooperation up in the air, Carrie begins investigating Sandy’s intentions within the CIA. “Will someone please explain to me what the hell Sandy Bachman was doing here without protection?” Carrie asks her team. “Sandy’s intel was good,” says one of her workers. “Maybe it was too good,” says Carrie. “No one wants to admit the possibility that he was spying right under our noses.”

After two episodes of Saul Berenson (Mandy Patinkin) being missing in action, Saul, now in the private sector, makes a more memorable appearance alongside Carrie in episode 3. Their reunion on the field, however, does not go as planned. “It looks like I reached out to you for help,” Carrie tells Saul. “That’s not exactly the mission I want to send.”

In a sneak peek of episode 3, we see Quinn dealing with the after effects of Sandy’s death. While Carrie previously cited Quinn’s attack on civilians and his subsequent arrest in episode 2 as a result of PTSD from their time serving overseas, CIA agent Dar Adal (F. Murray Abraham) has an alternative theory.

“This isn’t about PTSD. This is about your feelings for Carrie Mathison,” he says, threatening Quinn with “retraining” and accusing him of leaving Sandy to die at the scene because of his love for Carrie. “If she hadn’t been in that car, Sandy Beckham would be alive today … You took your eye off Sandy to save Carrie,” he says. His remark causes Quinn to lash out, almost choking Dar to death. When Quinn eventually releases him from his grip, Dar is pleased with his violent reaction. “Well done, Peter,” he says. “I knew you weren’t that far gone.”

“Homeland” Season 4 episode 3 will air on Sunday, Oct. 12, at 9 p.m. EDT on Showtime.