President Martinez orders Director of National Intelligence, Blake Sterling, to root out the mole from their staff, which causes Sterling to question his judgment of people close to him. Sophia reasserts her power over Thomas and the other detainees, and she prepares them for the next leg of their mission. Elsewhere, with the aid of Madeline, Sean continues his hunt for answers, all the while trying to stay one step ahead of the covert agents who trail him.

President Martinez, furious about recent security failures, demands answers from Director of National Intelligence, Blake Sterling. When he doesn't receive the progress that he desires, Martinez decides to personally interrogate Michael Buchanan about his involvement in the assassination attempt. While Michael holds to his claim that he doesn't know who is involved, he inadvertently reveals incriminating evidence about someone deep inside the President's staff. Meanwhile, Dempsey dispatches Vicky on a new clandestine mission. And, elsewhere, Sean and Leila scramble to stay ahead of the covert ops that are trying to silence them and what they know.

President Martinez reacts to the knowledge of who betrayed him within his administration. Meanwhile, after revealing her plan for the Sleepers' future, Sophia learns of dissension among her people. She sets a trap for the perpetrators and acts decisively to quell any future mutiny. Elsewhere, Sean and Leila try to unravel the mystery of Samantha's kidnapping, while evading Dempsey's nefarious clutches.

Sophia's suspicions are confirmed when Thomas reveals a shocking new plan. Leila and Sean battle mercenaries while searching for Samantha.

Meanwhile, newly appointed Alaskan Senator Catherine Lewis threatens to divulge information about the Mt. Inostranka detention facility on an episode of "HARDBALL with Chris Matthews." Elsewhere, Sean and Leila get a fresh lead on the whereabouts of Samantha, but it leads them to a dramatic turn in their lives. James Dempsey foresees that he and Sean will once again cross paths.

Thomas summons Sophia, Diane Geller, and the other Sleepers to reveal the contents of the game-changing message he received. With newfound intensity, President Martinez confronts Vice President Ray Jarvis about his betrayal. Sean blackmails Vicky into helping him on a mission of vengeance. Elsewhere, Dempsey continues on his hunt for experimental subjects.

Negotiations for the release of the Sleepers begin after Sophia triggers a national disaster; Sean and Vicky continue their mission.

The Sleepers mourn their losses after negotiations are derailed; Sterling tries to test Simon's loyalties; President Martinez asks Sen. Lewis to find any remaining moles in the White House.

Vice President Jarvis vocalizes his lack of faith in President Martinez's leadership and agrees to meet with an adversary. Senator Catherine Lewis reports the findings of her surreptitious blood testing of the White House staff only to find one holdout, someone very close to the President. Sophia pushes forward in her search for a super weapon. And, after witnessing injustices within the Sleeper community, Leila begins to question where she belongs. Elsewhere, Sean and Vicky find whom they've been hunting for, but it may be too late.