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 Lucas help the FBI search for a terrorist who escaped custody in West Virginia.

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.