CIA officer Daniel Miller arrives in Berlin on a clandestine mission to unearth an anonymous whistle blower, alias Thomas Shaw, and reunites with his old friend Hector DeJean. As Daniel gets closer to Shaw, his quarry reacts in a murderous fashion.
As Daniel pursues Shaw, Station Chief Steven Frost and his associates Valerie Edwards and Robert Kirsch gather intelligence on a Georgian Islamic radical in order to avoid an extraordinary rendition by Langley.
Frost and Kirsch worry their secrets will be unearthed when Langley investigators sweep Berlin Station to ferret out fodder for future Shaw leaks. Meanwhile, Daniel's hunt for the mole is put at risk.
Daniel and Hector embark on a dangerous operation to track down Shaw. Meanwhile, Valerie finds out the truth behind Iosava, and Frost and Kirsch deliberate future plans for themselves and the rest of Berlin Station.
Daniel teams up with Esther Krug of the BfV to prevent the next Shaw leak involving a foreign defector. Valerie and Robert spar over strategy as her investigation into Iosava gains traction; Hector gets a late-night visit from Shirley Pimple.
German and American interests align when the Station learns the subject of Shaw's next leak: Chinese defector Houjin Lin. Daniel is teamed with Esther Krug to secret Lin out of the country before the leak breaks and counters Shaw's attack. Hector gets a late-night visit from Shirley Pimple.
In the wake of the botched Iosava Op and Clare Itani's kidnapping, Frost pursues traditional channels to negotiate Clare's release; Hector goes rogue, bringing Daniel with him.
Consequences from the Iosava catastrophe continue to wreak havoc on the Station; Daniel tries to track down Frost and Kirsch is asked to undercut Valerie as payback; Daniel finds himself the subject of a polygraph.
After confirming Hector's identity as Shaw, Daniel still faces various obstacles in turning him over to the Germans; Frost remains a fugitive, Kirsch continues to trail the rendition; Valerie pursues her suspicions about Robert's loyalties.
Daniel leads the Berlin Station crew in gathering evidence that will illuminate Langley's role in the Iosava rendition; Hector takes a new approach to atoning for bad behavior; the Shaw mantle is passed.
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.
In an episode set completely in Spain over an intense 24-hour period, Daniel enlists the help of an unexpected ally to further his mission with Otto Ganz.
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.
BB Yates's past is revealed while she juggles keeping Berlin Station's Far Right operation covert or revealing it to Ambassador Hanes and Daniel discovers a lack of trust between Otto Ganz and his daughter.
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.
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 while Daniel deals with the psychological consequences of his mission.
Valerie Edwards sends Daniel Miller and Robert Kirsch on an urgent mission, where they meet renegade CIA Officer Rafael Torres, and uncover signs of a covert invasion.
The Station enlists Rafael Torres to track down a missing comrade's last known location, leading him to hostile territory. Kirsch visits an old friend Steven Frost.
Torres risks everything to bring a fallen comrade back to Berlin. April learns the true value of her asset's medical tech, and works with Sofia to track down the troll farm spreading disinformation in Estonia.
Kirsch and Torres follow a lead to Vienna, where they must risk their lives to secure their fallen comrade's location. When B.B. Yates returns to Berlin, the Station must decide whether or not they can trust an emissary of the Oval Office.
Frost introduces Torres to an old friend, whose new identity helps them infiltrate the Russian elite. April and Kirsch work to initiate a hostage swap.
B.B. and Valerie attempt to amass support for an intervention. April's assets face deportation. A dangerous figure invites Hector and Torres into dangerous territory.
Daniel and Hector find themselves needing to escape a tricky situation to meet Frost for an exfil. Torres fights to maintain his cover and give his allies a leading edge.
A powerful figure's fall from grace makes way for his ruthless successor to take the reins Estonia, where a cyberattack has blacked out the entire country in advance of the ground invasion. In turn, all of Berlin Station must try to take him down.
Mere hours remain before enemy forces topple the Estonian government and reclaim the country for Russia. Without Langley's backing, Berlin Station acts alone in one final desperate push to prevent the fall of a nation.
