Berlin Station continues to search for the truth behind Katerina Gerhardt's assassination and Nick Fischer's role in it, as a protest outside the US Embassy and calls to turn Hector over escalate.
Hector is wanted by German authorities for the assassination of Katerina Gerhardt, but Berlin Station begins to discover there is more at play than a jaded ex-CIA officer.
April weighs telling Robert about Hector's assassination plot; Daniel tries to arrange safe passage out of Berlin for Hector with help from Esther.
Robert and Frost travel to Norway to investigate the illegal money trail leading to PfD; BB and Valerie devise a new plan involving a member of the Far Right; Daniel deals with the psychological consequences of his mission.
The Station's sting operation to catch the Far Right in an arms deal goes horribly awry, with Otto Ganz escaping. Meanwhile, Robert and Frost make plans to investigate the money trail behind the PfD's nefarious dealings.
BB Yates's past is revealed while she juggles keeping Berlin Station's Far Right operation covert or revealing it to Ambassador Hanes; Daniel discovers a lack of trust between Otto Ganz and his daughter.
Valerie works to obtain intel on the Far Right while Robert's teenage son Noah arrives in Berlin and asks questions. Meanwhile, Frost agrees to the Ambassador's request to spy on Berlin Station.
In a 24-hour episode set completely in Spain, Daniel uses Hector to further his mission with Otto, much to Hector's dismay.
Under the direction of new Chief of Staff BB Yates, Daniel Miller, Robert Kirsch, Valerie Edwards and the rest of Berlin Station embark on an unsanctioned operation to uncover a possible Far Right terrorist attack.