Charleston and the team are in a race against the Russians over a stranded Russian submarine holding six months of stolen U.S. secrets -- their one advantage is that they have a CIA asset on board. At the same time, the texter persists, sending Charlie a damning picture, while Nick forces her to question if Fatah was ever really her asset. Meanwhile, President Payton appoints a new CIA director, the formidable Ray Navarro.

Charlie and Nick both receive a threatening text that sends Nick on an investigation to find the source once and for all. Charlie flashes back to her first interactions with Fatah on Midnight City. Meanwhile, President Payton's rival Senator Green reveals just enough about the upcoming senatorial convoy attack report to cause her to question Charlie's faithfulness. Charlie and team have to employ Jack Dawkins to contain a smallpox contamination in Panama while avoiding detection in the country. Kurt continues to pine for Maureen but an unexpected kindness distracts her from his attentions.