Rok 1961. Brytyjski agent, Fielding Scott (Dominic Cooper), jedzie do Berlina, by wykonać swoją misję – zdemaskować i zlikwidować kreta działającego wśród aliantów.
Berlin, 1961: Fielding Scott, a disgraced MI6 agent, is given a chance to rehabilitate. He is supposed to organize the defection of an East German scientist who has made an explosive discovery. The operation fails, the deserter is murdered. There must be a mole within the Allied secret services. Scott goes on a dangerous search for the traitor.
The fatal fiasco of the Beethoven defection has consequences; Fielding is tasked with finding and eliminating the traitor; Fielding begins to recruit his own private army.
Fielding's Berlin life is unraveling; he decides to go rogue and provoke the Russians into retaliating; at the same time he is now being blackmailed over his affair with Severine.
Fielding feels threatened and drops out of sight; three urgent questions preoccupy him, including the Beirut photograph and the date of Sunday, Aug. 13
Fielding, reeling from the death of Severine, knows he has more to do; he must avenge Severine's death; he unmasks the traitor and all the Berlin mysteries are explained.