When an attempt on U.S. Army Sergeant Eric Carter's life is made after his return home from a mission to kill terrorist leader Bin Khalid, he discovers that he and his fellow Rangers' identities have been compromised.
When Grimes demands money in exchange for the list he seized from a safe box in Bin-Khalid's compound, Carter must go back to his roots to help obtain the money.
Carter must put his trust in CTU as he plans a meet up with Grimes to do the exchange. Rebecca and Donovan try to isolate the leak. Amira and Harris deal with a slight hiccup in their plan.
Grimes comes to Carter with information that might lead them to the terrorists. Meanwhile, at the Donovan compound, Nilaa is sequestered and questioned by Rebecca.
Carter and Grimes try to find out the location of the terrorists for whom they've been searching. Amira and Khasan get a visit from an unexpected guest. Progress is made on the leak.
Carter turns to Andy for help in order to get crucial evidence back in their possession. Rebecca calls in someone from the outside when CTU's regular interrogation techniques lead them to a dead end.
Mullins and CTU try and track down Carter. Andy is forced to do something he doesn't want to. Rebecca's interrogation techniques lead Donovan to question her judgment. Isaac turns to his friends for help.
A threat forces CTU to go on lock-down. Carter finds himself in a tense situation. Donovan reaches out to Rebecca when he faces a big decision in his campaign.
Rebecca's personal and work life collide when she gets a phone call that forces her to make an important decision. Nicole confronts Carter about his commitment to their relationship and his future with the CTU.
A reinforcement is brought into CTU to oversee operations. Andy uncovers important information about a high-ranking official, leading Donovan and Carter to team up and find out more.
Carter and Donovan's deal to save Rebecca doesn't go as planned. CTU must rely on Carter to go out into the field and facilitate an important exchange.
