A stranded Russian submarine contains stolen U.S. secrets. Charlie receives an incriminating picture. President Payton selects a new CIA director.

A high-stakes investigation puts the focus on proving a sorority girl is in fact a member of a terrorist cell. Meanwhile, Charlie faces possible betrayal, and Nick Vera inches closer to contacting Omar Fattah.

Charlie and Payton must decide what they are willing to sacrifice in order to apprehend a terrorist.

Charlie quits the CIA to track down Omar Fatah; the seventh floor team vows to help Charlie.