CIA analyst Charlie Tucker and President Payton consider how to avenge the death of Payton's son, who was killed a year ago in Kabul when a diplomatic convoy was attacked.

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

Charlie remembers the first time she met Nick; members of a militant Islamist movement capture 21 Nigerian girls; the Chinese president comes to Camp David.

After Charlie and Nick receive a threatening text, Nick embarks on an investigation to find the source; information from a rival causes President Payton to question Charlie's faithfulness; Jack Dawkins must contain a smallpox contamination in Panama.

President Payton has questions for Nick Vera after part of the convoy attack report is leaked; Kurt works up the courage to show Maureen his hand.

On a trip to Qatar with the president, Charlie deals with a local who claims to be a CIA asset, but the agency has no record of the man; Charlie takes a deadly risk in pursuit of the truth about her fiancé's death.