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

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.