Bonn, 1954: the former German capital in the middle of the Cold War. This is where 20-year-old Toni Schmidt (Mercedes Müller) returns after a language study trip to London. Her family enjoys the new prosperity between refrigerator and television set at the time of the German economic miracle. But Toni wants more: she gets a job with the predecessor organization of today’s Federal Intelligence Service. Otto John (Sebastian Blomberg), who as head of the Federal Intelligence Service tracks down war criminals, becomes aware of Toni. John is convinced that Toni’s boss Reinhard Gehlen (Martin Wuttke) supports former Nazis. John decides to send his best assistant, Wolfgang Berns (Max Riemelt), after Toni. Berns is supposed to recruit her as a double agent for the intelligence service. The ambitious young woman gets caught between the fronts of the intelligence services and also gets emotionally closer and closer to Wolfgang Berns. But who can she really trust?