シーズン2・The Agency follows Martian (Fassbender), a covert CIA agent ordered to abandon his undercover life and return to London Station. When the love he left behind reappears, romance reignites. His career, his real identity and his mission are pitted against his heart; hurling them both into a deadly game of international intrigue and espionage.

距離や嫉妬、取り巻く環境がニックとノアを引き裂こうとするが、２人は自分たちの愛があらゆる困難に打ち勝ち、永遠に続くことを証明しようと奮闘する。