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London, 1963. Nicholas Elliott (Damian Lewis), a top agent of the British intelligence service, is given the delicate mission of keeping a close eye on his friend and colleague Kim Philby ( Guy Pearce) , after it comes to light that he has been working for the KGB for more than 20 years. Elliott must travel to Beirut to bring him back and extract a confession. But shortly after their meeting, Philby defects to the Soviet Union without a trace, and Elliott must return to London with his loyalty under suspicion. As he tries to come to terms with his friend's personal betrayal, Elliott finds himself in the midst of a thorough interrogation to determine if he helped Philby's escape or if he was just another victim of his double life.