In a 24-hour episode set completely in Spain, Daniel uses Hector to further his mission with Otto, much to Hector's dismay.

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.

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.

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.

Valerie's investigation into Aleksandre and Ruth Iosava comes to a head in a German/American sting Operation involving Clare Itani, a CIA Officer and Hector’s lover. Langley's unannounced participation moves things from bad to worse.

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.

Berlin Station follows up on the evidence Kirsch brought home from his mission, crystallizing their theory about a possible upcoming invasion.

The mystery of Shaw's true identity finally solved, Daniel confronts his own conscience as he learns the origins of "Thomas Shaw"; Valerie’s suspicions about Robert further escalate rising tensions between them, and Kelly Frost suddenly becomes an integral part of the team.

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.

The Station enlists Rafael Torres to track down a missing comrade's, Daniel Miller's last known location, leading him to hostile territory. Kirsch visits an old friend.

The explosion of a fishing boat is detected. CIA agent Rafael Torres violates the order of the Station Chief of Berlin Station, and retrieves the burned body that he believes is of missing CIA agent Daniel Miller.

Daniel and Hector are being hunted by Vassily Krik. They manage to find shelter in a green house in the woods where a well-kept secret will be revealed.

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. By episode’s end, Hector surprises us all.

Daniel assembles the crew as they piece together the extent of Langley's involvement in the Iosava rendition. Steven and Kelly Frost reunite against the odds; Hector pursues a new approach for his atonement – and the Thomas Shaw mantle is passed.

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.

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.

Repercussions from the Iosava debacle leave Frost in the shadows and the Station in disarray as Robert embraces a new role. Hector finds himself in the hot seat, Valerie reveals a secret of her own––and Daniel inches closer to the truth.

Kirsch and Torres 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 volunteers with Valerie's reluctant consent to rescue Daniel from Krik's estate. When Daniel confronts Frost about his past alias as "Diver" shots are fired. Hector is a secret witness. Krik is arrested by his government. Daniel's body is dumped on the streets of Berlin. Torres uses his cover as a ruse to get Platov to Germany. The Estonian communications network is hijacked, but Sofia can only use her master password by returning to her country.

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.

Valerie and B.B. rally the support of the 14-Eyes, a powerful intelligence collective. Kirsch and April, using Sofia as bait, trap Sergei. Kirsch offers to swap Sergei for Daniel. April comes clean to her asset, securing the tech for U.S. interests. Esther activates Bruno, a German Special Operator, to locate Daniel. Frost introduces Torres to Hector, whose new identity as a roofer to oligarchs provides a way to infiltrate the Russian elite. Frost investigates one of the soldiers formerly under Krik's command to gain kompromat from his war days.

Valerie is stunned when B.B. betrays her and votes against the 14-Eyes invoking Article 5. April faces the loss of the tech when her assets are arrested and face deportation. Kirsch's spy swap goes horribly awry when Bruno, Esther's officer, is exchanged instead of Daniel. Platov invites Hector and Torres to Krik's dacha, forcing them to navigate the treacherous world of Russian oligarchs. Their mission is upended when Hector falls out of favor with Krik and finds himself human prey in their evening hunt, along with one other prisoner: Daniel.

Mere hours remain before enemy forces topple the Estonian government. Without Langley's backing, Berlin Station acts alone in one final desperate push to prevent the fall of a nation.

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.